I updated the link to point to the new github repo. Please download the new Release.zip file and extract it into the same folder as the game itself, then launch the game. It should all be working now. The last game update changed from 32-bit to 64-bit, so the loader wasn't activating.
I just tested it myself, with the latest game version (1.1.0.1) and the latest mod release build (1.2.0 at the time) and it worked fine for me. I've made an update to include the mod version in the overlay that will release shortly (ten minutes at most) that you can try, and that I can confirm definitely works. If that still doesn't work, please open an issue on the repo tracker and we can try to figure out what's wrong.