IOS is for iPads and iPhones.
Your profile shows your are running 10.7 - true?
Check that your computer is compatible with Mountain Lion/Mavericks.
To check the model number hold down the option/alt key, go to the Apple menu and select System Information.
- iMac (Mid 2007 or newer) model number 7,1 or higher
- MacBook (Late 2008 Aluminum, or Early 2009 or newer) model number 5,1 or higher
- MacBook Pro (Mid/Late 2007 or newer) model number 3,1 or higher
- MacBook Air (Late 2008 or newer) model number 2,1 or higher
- Mac mini (Early 2009 or newer) model number 3,1 or higher
- Mac Pro (Early 2008 or newer) model number 3,1 or higher
- Xserve (Early 2009) model number 3,1 or higher
Your Mac needs:
- OS X v10.6.8 or OS X Lion already installed
- 2 GB or more of memory (More is better - 4 GB minimum seems to be the consensus)
- 8 GB or more of available space
Check to make sure your applications are compatible. PowerPC applications are no longer supported after 10.6.
Application Compatibility
Applications Compatibility (2)