Note that if you have any previous v3.00 build already installed, you only need to copy UPDATE.ROM to the /POWERPAK folder on your CF card, start up your PowerPak, go to the settings menu, and select "Check for firmware update." After the upgrade flashing procedure has finished (i.e., the PowerPak intro screen appears), power-cycle your SNES just to be sure, and you're all set.
On a side note, the source code is available on GitHub as well, so if you should encounter any potential bugs, feel free to open an issue there, and I'll look into it ASAP.