@zacwestmore Are they all in Documents\Electronic Arts\The Sims 3\Downloads? It's possible that Sims 3 is reading a different game folder than the one where you put the downloads. To find out, check the last modified date on the file labeled deviceconfig.log, also inside the Sims 3 game folder. It should match the last time you launched the game. If it doesn't, then this isn't the folder being used.
If this isn't the issue, try moving all the files out of Downloads, put just one back in, and let me know whether the launcher reads it properly or not.