Re: Problems with DCCache + "CurrentGame.sims3"
@BandsAndRoses The CurrentGame folder should always be empty unless you're playing and actually have a save loaded. Otherwise, the game empties this folder when you quit. So placing files in this folder won't accomplish anything.
It's odd that your old DCCache files would cause your save to not show up at all; I've actually never heard of that. If you create a new save with these files in place and save your progress, does that save show up the next time you load the game? Before testing, make sure to back up your saves, or just the entire Saves folder, just in case something goes wrong.
I don't know that the above will change anything. If it doesn't, or you don't want to wrestle with this problem anymore, you can try recovering the files from Downloads inside the old Sims 3 folder. This folder contains anything you've downloaded from the Store or Exchange, and moving the files to Downloads within the new Sims 3 folder should make the launcher read them properly and allow you to reinstall the content.
And in case it's not totally clear, DCCache contains your installed Store content (in bundled .ebc files) and launcher-installed custom content (in .dbc files). So you shouldn't have lost any other content.