Unofficial Game Modification

Problem

I get the following error message: It looks like you have installed an unofficial game modification that does not match your current version of The Sims 3. We recommend that you either uninstall these game modifications or get updated versions of them – otherwise you may experience crashes or significant bugs

Unofficial

Cause

  • Since patch 1.12/2.7/3.3/4.0 the game knows if you are using a CoreMod like  AwesomeMod, ErrorTrap or EGC
  • Left over files from the old modding framework (Install Helper Monkey)
  • Cracked version of the game

Solution

  • Never use a core mod with a different patch version than it’s for.
  • Remove all left over files form the old modding framework. Follow instruction here on how to do so: Game Help:Installing Sims 3 Package Files/Old Way to New Way
  • Go buy the game if you intend to play. If you did buy it after using a cracked version, make absolutely certain that the cracked version is gone completely.
Credits

Further Reading