Sims 3 With Everything Installed... Base Game Not There?

I have my Sims 3 Base Game and all of the expansions (except Generations, not quite there yet.)
All of these games have been downloaded, installed, and fixed by Games4TheWorld.
Installation Guide is always followed religiously just in case.

I go to play the Sims (via clicking the Late Night launcher) and I look down to my little bubbles.
It says that Generations isn't installed (obviously)
But, it also says that the Sims 3 (just the base game) isn't installed.
When ALL my expansions are.


Uhhh...?
And it won't let me play the game for that reason.

Anything I can do to fix it without uninstalling everything "Sims Related" on my computer and reinstalling it?

//EDIT

PS. I can't play the Sims 3 until this is fixed...
*sniffles*

Off to Sims 2 I go.

Hello,

Well, are you sure you have the base game installed correctly?
If yes, try this (Read the Installation Guide carefully!): https://games4theworld.forumotion.com/t752-the-sims-3-latest-fix-should-fix-most-of-your-problems