I know this might not be what you want to hear however I just reinstalled sims 3 and all my expansions and have no issues at all with the launcher other than a it stops responding sometimes.
If you backup your downloads then uninstall all expansions and sims 3 including CAW and the pattern program if they are installed. Make sure all sims 3 folders are then removed. Next run a registry cleaner like ccleaner. Run this over and over untill it can't find any errors to fix.(ccleaner is a free cleaner that works good.) Reboot your comouter.
Install the base game and the latest EADM. Let the base game update. install then next expansion and let it update. keep doing this untill each expansion is fully up to date. Next try to download all new items however don't install them after they download. Copy the items from the backed up copy of your downloads folder and add them to the new downloads folder then use the select all comand and have everything install at the same time. After you get the launcher working download the latest version of CAW and/or CAP then check that they work.
