The contents of this repo is distributed through releases in Arduino IDE.
Tools > Board > Boards Manager > Intel Curie Boards by Intel

If you wish to use the latest untested changes, follow these instructions.

1. Install the latest Intel Curie Boards by Intel from Boards Manager
2. Download the latest snapshot of this repo
3. Shut down the IDE
4. Go to Arduino15 directory

• Windows: C:\Users\<user>\AppData\Roaming\Arduino15
• OS X: ~/Library/Arduino15
• Linux: ~/.arduino15

5. Go to packages/Intel/hardware/arc32/<version>/
6. Delete the content of the directory from step 5, and replace it with the content of the zip from step 2

Future upgrades may fail since the internal contents were modified by hand. In order to recover, shut down the IDE, delete the entire Arduino15 directory, then restart the IDE.