Gamemode Not Installing

I’m trying to install Flow Bunny Hop to my personal gamemodes, but since it doesn’t have a .gma file anywhere, I can’t install it via addons. I need to put it into the gamemodes folder. When I do, it doesn’t work. The info.txt file is there, so I don’t know what’s wrong. Sure, the gamemode was meant for a server, but I did it before and I have no idea how.