TSR Pets CC Bug Fixer - Step 3
Note that you will need to update your game to at least 1.26 for PC, 1.27 for Mac (or install the Pets EP) for any new CC to work which you download after October 20th 2011.
Step 3 - Fixing your Content
Step 3.1 - Fixing your sims3pack filesNow that your game is fixed you might like to fix all of your sims3pack files that you downloaded and keep as a backup too. To do this, run TSR Rigfix and click 'Choose Folder'. Browse to the folder where you keep your downloaded files and you will again see a list of them all appear.
Click 'Fix Selected' and your backups will now also be compatible so that you don't need to fix them again in the future.