Please can you provide more information about your Mac. Instructions on how to do so here - https://answers.ea.com/t5/The-Sims-Mac/CURRENT-ISSUE-The-Sims-3-Issues-playing-on-newer-post-2013-Ma... Please provide answers to all the questions asked.
Please create a new user account on your Mac, log into it and see if you are experiencing the same problems in that account.
Using CC/Mods is at your own risk, EA are not responsible for making the game compatible with 3rd party content, the creator is.