I do tell the launcher to install it. those come in sims3pack format and it says first that it cannot be installed because I need an update. Then I run it through the s3c and Decrapify and it shows up in my launcher. Then I click install and it says it's installed. So I run the game and it's nowhere to be found. When I shut down the game for the night or because I have to work, it's back in the download tab in the launcher and it says it needs to be installed.
I had this problem previously with no idea how to correct it... until now, that is. I was originally opening sims3packs on my desktop. Sure, they show up with the success window and everything but once the launcher quits, it uninstalls itself. I now place them in the Downloads folder in My Documents and it works fine once everything is decrapified and such.
As for your problem, hellknowsimcoming, do you happen to have sr3c.exe and decrapify.exe in the Downloads folder? That's how my setup is and everything shows up fine in my game, including the More Magic Set.