Corrupted Mods

Hello! I was wondering if anyone could possible tell me what's wrong with my game and or cc. For some context I recently downloaded the sims onto my Mac and onto an external hard drive. When trying to play the game with cc, they always show up as corrupted. I feel like Ive tried everything I have found to fix it and I can't seem to figure out what's doing it. I have uninstalled and reinstalled the game, allowed the game to generate a new mods folder, deleted all my mods and re downloaded them, repaired the game and deleted things like localthumbcache but it seems like nothings working... every single piece of cc is said to be corrupted even if its newly downloaded