Download
Downloads are available from the mod's ModDB page
or right here as a 7z or zip archive. The 7z is about
40mb smaller, but it requires the 7zip archive utility
available for free from 7-zip.org. To install either,
extract the gamma_energy folder to your sourcemods
folder, which is typically located in
C:\Program Files\steam\steamapps on Windows.
Mac users can also use the mod, but the instructions
may be a bit more convoluted. I'll post details
and instructions when I've tried them myself.