updated installation instructions

Author: stevenbird

web/install.rst

@@ -6,12 +6,12 @@ NLTK requires Python versions 2.6-2.7 or 3.2+
 Mac/Unix
 --------
 
-#. Install Setuptools: http://pypi.python.org/pypi/setuptools
-#. Install Pip: run ``sudo easy_install pip``
-#. Install Numpy (optional): run ``sudo pip install -U numpy``
 #. Install NLTK: run ``sudo pip install -U nltk``
+#. Install Numpy (optional): run ``sudo pip install -U numpy``
 #. Test installation: run ``python`` then type ``import nltk``
 
+For older versions of Python it might be necessary to install setuptools (see http://pypi.python.org/pypi/setuptools) and to install pip (``sudo easy_install pip``).
+
 Windows
 -------
 
@@ -20,8 +20,8 @@ These instructions assume that you do not already have Python installed on your
 32-bit binary installation
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-#. Install Python: http://www.python.org/download/releases/3.4.1/ (avoid the 64-bit versions)
-#. Install Numpy (optional): http://sourceforge.net/projects/numpy/files/NumPy/1.8.1/numpy-1.8.1-win32-superpack-python3.4.exe
+#. Install Python 3.4: http://www.python.org/downloads/ (avoid the 64-bit versions)
+#. Install Numpy (optional): http://sourceforge.net/projects/numpy/files/NumPy/ (the version that specifies pythnon3.4)
 #. Install NLTK: http://pypi.python.org/pypi/nltk
 #. Test installation: ``Start>Python34``, then type ``import nltk``