Basically I forgot to include the new compat CVAR in the weapons only mod, so if you loaded it without loading any other version the rocket launcher would cause crashes. Thanks to the person who reported that. Should be fixed now.

The compat setting us under Sound & Effects Settings at the bottom. It removes quake effects from the rocket explosions, for those who don't want that.

EDIT: Right, I meant to mention, if you want your explosions to look the most like classic Doom with particles off, use "Snappy" instead of "Legacy".