Certain other mods and patches made for Bloodlines use the same technique. CQM now uses a 'mod loader' to install itself.
The install program resolves these differences so there is no risk in installing mods using the installer. Mods for Vampire are generally not cross-compatible so installing one mod ontop of the other, will most likely result in problems while playing the game. You will have to start a new game, after installing the mod.
It's important that you follow this guide, step-by-step, or else there is no telling how the mod will affect the game. For earlier versions of the mod, please refer to the documentation that was packaged with the mod. This is a brief guide with the latest, up-to-date instructions on how to install Clan Quest Mod, version 3.1 and later.