I have a late macbook pro 2007. I recently installed 2 (2GB) memory cards to get 4 GB. Processor Name: Intel Core 2 Duo Processor Speed: 2.2 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 4 MB Memory: 4 GB Bus Speed: 800 MHz I have OS X 10.8.5 on my imac so I downloaded to a flash drive. WHen I try to download to my macbook pro, it won't install. Any suggestions ????? ---------- Is it because I needed to have 10.6 to start off with ??