PEBKAC. Obviously you're not following the repack's instructions, otherwise you'd be able to avoid the issues. Of course it could be the repack, but since you haven't stated what in the sam hell you're using, I'm concluding you're having issues because you didn't read or follow the instructions or even looked around for the necessity to use every sims 3 patch in existence to install your games.
I have provided said information. The item in question is a repack. If further information is required regarding repacks (including what they are or what they do) I would recommend
this site.
Among other things, a repack's purpose is to eliminate the need to install every single add-on or update for the game one at a time. Though I use it because it's the only "ARR'd" version of the game that is somewhat playable for me.
You can get around the need to constantly patch or let the EP run an update by just downloading the Latest patch from the EA Website (Which you can do for an ARR'D game, but I will not google for you) , running it after installing Base & install the other EPs like normal.
Standard patches do not work for most repacks as they can not locate the install directory, which is the case here.