Owned EPs not showing in-game

Ctrl_Morgan222​  You don't need to use OneDrive, and as I mentioned before, if you've installed the game into any OneDrive folder, that's a really bad idea and should be avoided.  You can see the install location in the EA App, under Sims 3 > Manage > View properties.

Thank you all for your helpful replies! It does seem like one drive was the problem. Before this issue arose I had uninstalled one drive from my computer since I don’t use it for backup, and didn’t think that it would have any impact on game files. I uninstalled the game again and deleted all files related to the Sims 3 and EA, reinstalled one drive, and then reinstalled the base and expansion packs. Everything seems to be working as normal. Thank you again for your suggestions

LonaBoom​  Saves are user files, not program files.  As I said before, there is no way OneDrive could do anything to the program files unless the player installed the game into a folder that OneDrive touches.  Even in that case, it would be extremely unlikely for the base game to be entirely intact while the packs show in the launcher but don't load.

puzzlezaddict​ Over the years of playing The Sims 3 and The Sims 4, I’ve had recurring issues with OneDrive. It often pulled my save files and stored them there, leading to many being lost or sent to the Recycle Bin, forcing me to restore them. OneDrive has been a persistent problem not only with The Sims 3 but also with other video games.

Ctrl_Morgan222​  Please do a clean uninstall of Sims 3 and the EA App with Revo Uninstaller.  Here's how:

[Read First] Running Sims 3 in Windows | EA Forums - 8323446

The idea is that you might have broken registry entries or something else wrong with the game's hidden files, data that doesn't get removed during the normal uninstall process.

LonaBoom​  The only reason OneDrive would have anything to do with what DLC is loading is if the game were installed into a OneDrive folder.  And in that case, it's much more likely that the game wouldn't open at all than that somehow all the base game files would be intact but the DLC data would disappear.  I'm not saying OneDrive isn't a problem, only that it's almost exclusively a problem for user data.

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.