diff --git a/UnityLauncherPro/MainWindow.xaml b/UnityLauncherPro/MainWindow.xaml
index 0c750fc..1855248 100644
--- a/UnityLauncherPro/MainWindow.xaml
+++ b/UnityLauncherPro/MainWindow.xaml
@@ -48,8 +48,12 @@
             <!-- Tab: Projects-->
             <TabItem Header="Projects" Style="{DynamicResource TabItemStyle1}" Padding="0,0,0,0" Margin="-1,1,1,-1" BorderBrush="{x:Null}">
                 <Grid>
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="185*"/>
+                        <ColumnDefinition Width="693*"/>
+                    </Grid.ColumnDefinitions>
                     <!-- search box -->
-                    <Grid Background="{DynamicResource ThemeTextBoxBackground}" HorizontalAlignment="Left" VerticalAlignment="Top" Width="222" Margin="6,5,0,0" Height="20"  >
+                    <Grid Background="{DynamicResource ThemeTextBoxBackground}" HorizontalAlignment="Left" VerticalAlignment="Top" Width="222" Margin="6,5,0,0" Height="20" Grid.ColumnSpan="2"  >
                         <!--<TextBlock Margin="3,2" MinWidth="100" Text="Search" Foreground="{DynamicResource ThemeSearchPlaceholder}" Visibility="{Binding Text.IsEmpty, Converter={StaticResource MyBoolToVisibilityConverter}, ElementName=txtSearchBox}" Height="24" />-->
                         <TextBlock Margin="3,2" MinWidth="100" Text="Search" Foreground="{DynamicResource ThemeSearchPlaceholder}" Height="24">
                             <TextBlock.Style>
@@ -84,10 +88,10 @@
                         </Button>
                     </Grid>
 
-                    <Button Style="{StaticResource CustomButton}" ToolTip="Browse and add existing project to list" x:Name="btnAddProjectFolder" Content="Add Project.." Height="22" Width="78" HorizontalAlignment="Right" VerticalAlignment="Top"  Margin="0,4,38,0" Click="BtnAddProjectFolder_Click" BorderBrush="{x:Null}" TabIndex="10" />
-                    <Button Style="{StaticResource CustomButton}" ToolTip="Refresh list (F5)" x:Name="btnRefreshProjectList" Content="⟳" Height="22" Width="26" HorizontalAlignment="Right" VerticalAlignment="Top" FontSize="16"  Margin="0,4,3,0" Padding="1,-2,1,1" BorderBrush="{x:Null}" Click="BtnRefreshProjectList_Click" TabIndex="11"/>
+                    <Button Style="{StaticResource CustomButton}" ToolTip="Browse and add existing project to list" x:Name="btnAddProjectFolder" Content="Add Project.." Height="22" Width="78" HorizontalAlignment="Right" VerticalAlignment="Top"  Margin="0,4,38,0" Click="BtnAddProjectFolder_Click" BorderBrush="{x:Null}" TabIndex="10" Grid.Column="1" />
+                    <Button Style="{StaticResource CustomButton}" ToolTip="Refresh list (F5)" x:Name="btnRefreshProjectList" Content="⟳" Height="22" Width="26" HorizontalAlignment="Right" VerticalAlignment="Top" FontSize="16"  Margin="0,4,3,0" Padding="1,-2,1,1" BorderBrush="{x:Null}" Click="BtnRefreshProjectList_Click" TabIndex="11" Grid.Column="1"/>
 
-                    <DataGrid x:Name="gridRecent" HorizontalContentAlignment="Left" VerticalContentAlignment="Top" SelectionMode="Single" Margin="4,30,2,42" CanUserAddRows="False" Background="{x:Null}" BorderBrush="{x:Null}" ColumnHeaderStyle="{StaticResource HeaderStyle}" Padding="0" HorizontalScrollBarVisibility="Disabled" HeadersVisibility="Column" Foreground="{DynamicResource ThemeGridForeground}" HorizontalGridLinesBrush="{DynamicResource ThemeDatagridLines}" VerticalGridLinesBrush="{DynamicResource ThemeGridVerticalGridLines}" AutoGenerateColumns="False" PreviewKeyDown="GridRecent_PreviewKeyDown" Loaded="GridRecent_Loaded" TabIndex="2" CellEditEnding="GridRecent_CellEditEnding" PreviewMouseDoubleClick="GridRecent_PreviewMouseDoubleClick" ContextMenuOpening="GridRecent_ContextMenuOpening" BeginningEdit="GridRecent_BeginningEdit" RowHeight="21" ColumnReordered="GridRecent_ColumnReordered" Sorting="gridRecent_Sorting" >
+                    <DataGrid x:Name="gridRecent" HorizontalContentAlignment="Left" VerticalContentAlignment="Top" SelectionMode="Single" Margin="4,30,2,42" CanUserAddRows="False" Background="{x:Null}" BorderBrush="{x:Null}" ColumnHeaderStyle="{StaticResource HeaderStyle}" Padding="0" HorizontalScrollBarVisibility="Disabled" HeadersVisibility="Column" Foreground="{DynamicResource ThemeGridForeground}" HorizontalGridLinesBrush="{DynamicResource ThemeDatagridLines}" VerticalGridLinesBrush="{DynamicResource ThemeGridVerticalGridLines}" AutoGenerateColumns="False" PreviewKeyDown="GridRecent_PreviewKeyDown" Loaded="GridRecent_Loaded" TabIndex="2" CellEditEnding="GridRecent_CellEditEnding" PreviewMouseDoubleClick="GridRecent_PreviewMouseDoubleClick" ContextMenuOpening="GridRecent_ContextMenuOpening" BeginningEdit="GridRecent_BeginningEdit" RowHeight="21" ColumnReordered="GridRecent_ColumnReordered" Sorting="gridRecent_Sorting" Grid.ColumnSpan="2" >
 
                         <DataGrid.CommandBindings>
                             <CommandBinding Command="ApplicationCommands.Copy" Executed="CopyRowFolderToClipBoard" CanExecute="CanExecute_Copy"/>
@@ -241,7 +245,7 @@
                     </DataGrid>
 
                     <!-- bottom buttoms row -->
-                    <Grid VerticalAlignment="Bottom" Margin="4,0,8,5">
+                    <Grid VerticalAlignment="Bottom" Margin="4,0,8,5" Grid.ColumnSpan="2">
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition Width="14*" />
                             <ColumnDefinition Width="17*" />
@@ -492,7 +496,8 @@
                             <ColumnDefinition Width="20*" />
                             <ColumnDefinition Width="18*" />
                             <ColumnDefinition Width="28*" />
-                            <ColumnDefinition Width="26*" />
+                            <ColumnDefinition Width="14*" />
+                            <ColumnDefinition Width="18*" />
                         </Grid.ColumnDefinitions>
                         <Grid.RowDefinitions>
                             <RowDefinition Height="32" />
@@ -507,7 +512,10 @@
                             <Label Content="Download &amp; Install" Foreground="{Binding Path=Foreground, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Control}}}" />
                         </Button>
                         <Button Grid.Column="3" Style="{StaticResource CustomButton}" x:Name="btnOpenWebsite"  Margin="5,0,0,0" BorderBrush="{x:Null}" Click="BtnOpenWebsite_Click" >
-                            <Label Content="Release _Notes" Foreground="{Binding Path=Foreground, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Control}}}" />
+                            <Label Content="Release Notes" Foreground="{Binding Foreground, RelativeSource={RelativeSource AncestorType={x:Type Control}, Mode=FindAncestor}}" />
+                        </Button>
+                        <Button Grid.Column="4" Style="{StaticResource CustomButton}" x:Name="btnShowCumulatedReleaseNotes"  Margin="5,0,0,0" BorderBrush="{x:Null}" Click="BtnShowCumulatedReleaseNotes_Click" ToolTip="Show all Release Notes between the selected version and the older, closest one installed. Only works for final and patch versions." >
+                            <Label Content="Cumulative Release Notes" Foreground="{Binding Foreground, RelativeSource={RelativeSource AncestorType={x:Type Control}, Mode=FindAncestor}}" />
                         </Button>
                     </Grid>
                 </Grid>
@@ -790,7 +798,7 @@
                                     <CheckBox  x:Name="chkQuitAfterOpen" Content="Close after opening project"  Checked="ChkQuitAfterOpen_CheckedChanged" Unchecked="ChkQuitAfterOpen_CheckedChanged" ToolTip="Closes launcher after running project (not really useful)" HorizontalAlignment="Left"/>
                                     <CheckBox  x:Name="chkQuitAfterCommandline" Content="Close after launching from Explorer"  Unchecked="ChkQuitAfterCommandline_CheckedChanged" Checked="ChkQuitAfterCommandline_CheckedChanged" ToolTip="Close launcher after running from commandline or Explorer (recommended)" HorizontalAlignment="Left"/>
                                     <CheckBox  x:Name="chkAllowSingleInstanceOnly" Content="Allow single instance only"  Checked="ChkAllowSingleInstanceOnly_CheckedChanged" Unchecked="ChkAllowSingleInstanceOnly_CheckedChanged" ToolTip="Activates already running instance, instead of starting new exe (not working if app is minized to taskbar)" HorizontalAlignment="Left"/>
-                                    <CheckBox x:Name="useAlphaReleaseNotesSite" Content="Use Unity Alpha Release Notes Site (Unity 6 not supported)"  ToolTip="Use the superior (but alpha) Unity Release Notes (https://alpha.release-notes.ds.unity3d.com/) site when clicking on the ReleaseNotes button. Otherwise will default to the normal build page." Checked="UseAlphaReleaseNotes_Checked" Unchecked="UseAlphaReleaseNotes_Checked"/>
+                                    <CheckBox x:Name="useAlphaReleaseNotesSite" Content="Use Unity Alpha Release Notes Site (only for final versions) "  ToolTip="Use the superior (but alpha) Unity Release Notes (https://alpha.release-notes.ds.unity3d.com/) site when clicking on the ReleaseNotes button. Otherwise will default to the normal build page." Checked="UseAlphaReleaseNotes_Checked" Unchecked="UseAlphaReleaseNotes_Checked"/>
                                     <CheckBox x:Name="chkStreamerMode" Content="Streamer Mode (hide project names and folders)"  ToolTip="Hide project names and folders in main view" Checked="ChkStreamerMode_Checked" Unchecked="ChkStreamerMode_Checked" HorizontalAlignment="Left"/>
                                     <!--<StackPanel Orientation="Horizontal" Margin="0,0,0,4">
                                 <TextBox x:Name="txtTemplatePackagesFolder" BorderBrush="Transparent" CaretBrush="{DynamicResource ThemeSearchCaret}" Background="{DynamicResource ThemeTextBoxBackground}" SelectionBrush="{DynamicResource ThemeSearchSelection}" Foreground="{DynamicResource ThemeSearchForeground}" ToolTip="Folder for your custom unitypackage templates (for new project)" Padding="0,3,0,0" Width="110" TextChanged="TxtTemplatePackagesFolder_TextChanged" />
diff --git a/UnityLauncherPro/MainWindow.xaml.cs b/UnityLauncherPro/MainWindow.xaml.cs
index c1ecc6a..14c823b 100644
--- a/UnityLauncherPro/MainWindow.xaml.cs
+++ b/UnityLauncherPro/MainWindow.xaml.cs
@@ -46,7 +46,7 @@ public partial class MainWindow : Window
         System.Windows.Forms.NotifyIcon notifyIcon;
 
         Updates[] updatesSource;
-        public static List<string> updatesAsStrings;
+        public static List<string> updatesAsStrings = new List<string>();
 
         string _filterString = null;
         bool multiWordSearch = false;
@@ -140,6 +140,7 @@ void Start()
 
             // clear updates grid
             dataGridUpdates.Items.Clear();
+            dataGridUpdates.SelectionChanged += DataGridUpdates_SelectionChanged;
 
             // clear buildreport grids
             gridBuildReport.Items.Clear();
@@ -177,6 +178,18 @@ void Start()
             isInitializing = false;
         }
 
+        private void DataGridUpdates_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            var selectedUp = GetSelectedUpdate();
+            bool showCumulative = false;
+            if (selectedUp != null)
+            {
+                var unityVer = GetSelectedUpdate().Version;
+                showCumulative = Tools.HasAlphaReleaseNotes(unityVer);
+            }
+            btnShowCumulatedReleaseNotes.IsEnabled = showCumulative;
+        }
+
         // bring old window to front, but needs matching appname.. https://stackoverflow.com/a/36804161/5452781
         private static void ActivateOtherWindow()
         {
@@ -1542,6 +1555,12 @@ private void BtnOpenWebsite_Click(object sender, RoutedEventArgs e)
             Tools.OpenReleaseNotes(unity?.Version);
         }
 
+        private void BtnShowCumulatedReleaseNotes_Click(object sender, RoutedEventArgs e)
+        {
+            var unity = GetSelectedUpdate();
+            Tools.OpenReleaseNotes_Cumulative(unity?.Version);
+        }
+
         private void ChkMinimizeToTaskbar_CheckedChanged(object sender, RoutedEventArgs e)
         {
             if (this.IsActive == false) return; // dont run code on window init
diff --git a/UnityLauncherPro/Tools.cs b/UnityLauncherPro/Tools.cs
index d673f0e..08f10bd 100644
--- a/UnityLauncherPro/Tools.cs
+++ b/UnityLauncherPro/Tools.cs
@@ -583,28 +583,25 @@ public static bool VersionIsAlpha(string version)
 
         public static bool VersionIsChinese(string version)
         {
-            return version.Contains("c1");
+            return version.Contains("c1");  
         }
 
+
+        //as of 21 May 2021, only final 'f' versions are now available on the alpha release notes for Unity 2018 and newer. 2017 and 5 still have patch 'p' versions as well.
+        public static bool HasAlphaReleaseNotes(string version) => VersionIsArchived(version) || VersionIsPatch(version);
+
+        public static string GetAlphaReleaseNotesURL(string fromVersion, string toVersion = null) 
+            => "https://alpha.release-notes.ds.unity3d.com/search?fromVersion=" + fromVersion + "&toVersion=" + (toVersion != null ? toVersion : fromVersion);
+
         // open release notes page in browser
         public static bool OpenReleaseNotes(string version)
         {
             bool result = false;
             if (string.IsNullOrEmpty(version)) return false;
-
-            //var url = Tools.GetUnityReleaseURL(version);
             string url = null;
-            bool noAlphaReleaseNotesPage = version.Contains("6000") && !version.Contains("f");
-            if (Properties.Settings.Default.useAlphaReleaseNotes && !noAlphaReleaseNotesPage)
+            if(Properties.Settings.Default.useAlphaReleaseNotes && HasAlphaReleaseNotes(version))
             {
-                //with the alpha release notes, we want a diff between the 2 versions, but the site just shows all the changes inclusive of from
-                // so we need to compare the currently selected version to the one right after it that is available (installed or not)
-
-                var closestVersion = Tools.FindNearestVersion(version, MainWindow.unityInstalledVersions.Keys.ToList(), true);
-                var getNextVersionToClosest = closestVersion == null ? null : Tools.FindNearestVersion(version, MainWindow.updatesAsStrings);
-                if (getNextVersionToClosest == null) getNextVersionToClosest = version;
-
-                url = "https://alpha.release-notes.ds.unity3d.com/search?fromVersion=" + getNextVersionToClosest + "&toVersion=" + version;
+                url = GetAlphaReleaseNotesURL(version);
             }
             else
             {
@@ -617,6 +614,36 @@ public static bool OpenReleaseNotes(string version)
             return result;
         }
 
+        public static bool OpenReleaseNotes_Cumulative(string version)
+        {
+            bool result = false;
+            if (string.IsNullOrEmpty(version)) return false;
+
+            string url = null;
+            var comparisonVersion = version;
+            //with the alpha release notes, we want a diff between an installed version and the one selected, but the site just shows all the changes inclusive of "fromVersion=vers"
+            //so if we find a good installed candidate, we need the version just above it (installed or not) that has release notes page
+            var closestInstalledVersion = Tools.FindNearestVersion(version, MainWindow.unityInstalledVersions.Keys.ToList(), true);
+            if (closestInstalledVersion != null)
+            {
+                comparisonVersion = closestInstalledVersion;
+                string nextFinalVersionAfterInstalled = closestInstalledVersion;
+
+                //wwe need a loop here, to find the nearest final version. It might be better to warn the user about this before opening the page.
+                do
+                    nextFinalVersionAfterInstalled = Tools.FindNearestVersion(nextFinalVersionAfterInstalled, MainWindow.updatesAsStrings);
+                while (nextFinalVersionAfterInstalled != null && !HasAlphaReleaseNotes(nextFinalVersionAfterInstalled));
+
+                if (nextFinalVersionAfterInstalled != null) comparisonVersion = nextFinalVersionAfterInstalled;
+
+            }
+            url = GetAlphaReleaseNotesURL(comparisonVersion,version);
+            
+            OpenURL(url);
+            result = true;
+            return result;
+        }
+
         public static void OpenURL(string url)
         {
             Process.Start(url);
@@ -1040,10 +1067,14 @@ private static string FetchUnityVersionNumberFromHTML(string url)
 
         public static string FindNearestVersion(string currentVersion, List<string> allAvailable, bool checkBelow = false)
         {
+            if (allAvailable == null)
+                return null;
+
             string result = null;
 
             // add current version to list, to sort it with others
-            allAvailable.Add(currentVersion);
+            if (!allAvailable.Contains(currentVersion))
+                allAvailable.Add(currentVersion);
 
             // sort list
             if (checkBelow)