I tried to install SparrowAPI and DoggyTalents to my vanilla and FTB client. But something has gone wrong. A question mark shows up on the Minecraft icon, and it won't open. I heard on another thread that you should redownload Minecraft to fix the issue, but my Mac is filling up (OSX version 10.6.8, I think Snow Leopard??) and I need to delete all of the files relating to Minecraft and FTB because there is not room for two copies. If you can help me, please reply.
How do you find appdata?