sims 3 game launcher not working mac os tahoe 26.1

1drumbeat​  Are you talking about files with the .package extension, which go in Mods > Packages; or are you talking about files with the .Sims3Pack extension, which go in Downloads and need to be installed through the launcher?  Any .package files you see will load as long as they work and you delete the cache files after adding them, but they don't show up in the launcher.

If it's hard to describe what you're doing, you can always post screenshots.