nessatay2223
It definitely sounds like this is part of the new Mac 64-bit issues since the Sequoia 15.6.1 update. A few players have confirmed the same problems — launcher crashing on the Downloads/Installed Content tabs, world address text showing up (DOT10_World/Empty), and plumbobs disappearing after a short play session — even on completely clean installs.
At this point, it looks to be a compatibility issue between the current Sims 3 64-bit build and the latest macOS update. EA are aware and it’s likely we’ll see a patch soon to address it.
For now, the best steps are:
Keep your The Sims 3 folder backed up.
Clear the game’s cache files regularly.
Avoid reinstalling store content until the launcher fix arrives (since that’s what’s crashing right now).
It won’t damage your game, but you may see some minor visual or data oddities until the update rolls out. Hopefully we’ll get confirmation from EA soon.