The game comes with a mod manager now (not sure how long ago that was added) - most GOOD mods don't overwrite game files anymore, instead they go in LonaRPG\ModScripts\_Mods and then are toggled in the MODS menu. I'm particularly fond of the mods I fiddled with (duh) - only the VisualQOL stuff is truely mine (minus white cum) - the rest I just decided to step in because they weren't working for the current version.
The Wiki has a selection of mods (can't promise they all work) and there's a website called raidgame.ru that has additional mods. I'm still waiting for them to make RolePlayS 7.0 available to the public - ver. 6 isn't compatible with the latest version of the game.