how can i upgrade to os x mavericks from 10.8.0
i cannot upgrade to os x mavericks with a 2013 macbook pro with os x 10.8.0
MacBook Pro, OS X Mountain Lion (10.8), 2 CPU's Intel,2GB 1 RAM,Intel GPU's
Click the Apple icon on the top left of the screen and select Software Update.
There will probably be a long list. You only need the OS 10.8.5 combo update.
After that is installed and the computer has restarted, look at Software Update again.
Down load OS 10.9.1 and install.