Rockstar does not officially allow GTA V mods in offline singleplayer mode.
Rockstar does not officially allow GTA V mods in offline singleplayer mode.
The problems come from how they identify mods. They only notice the service that loads them, not whether the mods are actually active. If you begin using mods, avoid online connections, and when you need to return, perform a fresh installation.
You can turn off mods using NexusModManager—it's not something I've tried before, but it should work for GTA Tho.