Hello, I've tried so many different solutions recommended online for this over the last few days but hopefully someone here can help. The four TS3 expansion packs I own (World Adventures, Generation...
I don't know if this would help but it's worth sharing with you because I've had my issues with Microsoft OneDrive, being unable to play my game in the past dealing with OneDrive have been known to cause problems with The Sims 3 and also The Sims 4 too. I keep OneDrive turned off because it will delete or move game folders.
Sharing :
Why OneDrive can break Sims 3 expansions
The Sims 3 stores all of its user data in:
Documents → Electronic Arts → The Sims 3
When OneDrive is active, it often:
• Moves the Documents folder into OneDrive
• Syncs the Sims 3 folder to the cloud
• Locks or redirects files while syncing
• Breaks file paths the game needs to detect expansions
This can cause:
• Only the base game to load
• Expansion packs not being recognized
• Missing worlds (Bridgeport, etc.)
• Saves showing as “requires expansion pack not installed”
• Launcher showing packs installed but game ignoring them
Which is exactly what the forum user is experiencing.