I've installed mod, then deleted it. Now, when I try to launch the game, it crashes. I saw a "rwr_clean.exe", that should help me, in a post, that was made a long time ago, but that URL is broken. Error says: "OGRE EXCEPTION(4:ItemIdentityException): ParticleSystem template with name "UpDust2" already exist. in ParticleSystemManager::createTemplate at ..\..\..\..\OgreMain\src\OgreParticleSystemManager.cpp (line 289)

If the mod did something to RWR vanilla files, Steam file verification might help https://support.steampowered.com/kb_art ... -QEUH-3335

If it doesn't, you may need to uninstall the game, go see the installation folder (e.g. C:\Program Files (x86)\Steam\steamapps\common\RunningWithRifles) that it's empty, and reinstall.