Bee_in_da_Box For pack issues, see Packs/Worlds showing as deactivated in-game/Not active after purchase | EA Forums - 13261188 What to do is explained there.
When you say you lost saves and CC, was your user folder deleted completely? That normally won't happen, but sometimes we've seen cases where someone who has OneDrive and very little disk space ends up with OneDrive moving the Sims folder online when the game updates because it needs the space for the update process. iCloud might do the same thing. It's highly recommended to set up those programs so that they never touch Sims files. They break the game.
If you're not able to launch the game with CC but can without it, add it in smaller batches. Double check installation instructions in How to Use Mods and CC - now and then I run into someone accidentally using the wrong location.
