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For software setup, we strongly recommend using the pre-configured Arduino software. The download links and instructions can be found in the User Manual. The pre-configured Arduino software has the necessary hardware profile and SquareWear library pre-installed, and has simplified menu options.
If you use Windows 8 and/or 64-bit OS, and is having trouble installing the USBasp driver, try using the pre-configured VirtualBox image, which is also documented in the User Manual.
If you have to program SquareWear using an existing Arduino installation, you can download SquareWear hardware profile and library files form the Github repository below, then follow the instructions in the README.txt to copy files into the corresponding folders in your existing Arduino installation.
You can also find schematic, board design files, and part list of all versions in the Github repository below.