I have successfully reinstalled Spore, C&C and GA since posting this. The way you download the patches has changed since SL and as no one said before, because we supposedly had to have the patches first, the patches are in the extensions.
First you have to properly remove the game with freeware here at Apple called AppCleaner. Delete Spore folder in My Documents, remove from dock, empty trash and clear history. More info on Sporums for backing up saved games and creations.
Creepy and Cute have patch 1 & 2. Galactic Adventure have patches 3 & 4. A Spore Master finally told me that Patch 5.1 have the prior patches also but won't put that key info in the notes as I have asked them to so I don't know if that is true or not.
The key is to not let it Auto Patch ever and if you do not have C&C or GA then install Spore and do not auto patch. Open and close the game then do a manual install of the patch 5.1.-do not auto patch.
I made a detailed post here. And so far is working for me.
http://forum.spore.com/jforum/posts/list/42209.page