I am using Linux Arch (more specificaly, Garuda) and I wanted to use the effects plugin, but since the site and github only show versions for debian, I tried with the 3 (bulleyem bookworm and buster) by going into the settings > plugins and install the decompreesed file, but then nothing happened, it didn't add it. I also tried going into usr/share and making the directory openrgb/plugins and put it there, but it didn't work either. Has anyone had this problem and fixed it?
You should be able to use the Bookworm version. I use the Bookworm effects plugin build with Arch Linux x86_64 (using the openrgb-git package from Chaotic-AUR but it should work with the official 0.9 release too). The plugin path is ~/.config/OpenRGB/plugins.