HT3606: About the Mac OS X v10.5.8 UpdateLearn about About the Mac OS X v10.5.8 Update
Currently Being ModeratedAug 20, 2012 7:10 PM (in response to lashondafromtx)
If you have a PowerPC Mac, you can't. If you have an Intel Mac, phone the Apple Store and order a Mac OS X 10.6 DVD.
Currently Being ModeratedAug 21, 2012 12:20 AM (in response to lashondafromtx)
Following Neil's post ... the DVD will arrive as 10.6.3. You should then update it further, via the combo update, to 10.6.8 which will bring you the App Store.
I know you haven't asked but If you hope to go further, read up on the OSX system requirements. Some early intel machines may not work with Mountain Lion, for example.
Minimum specs for Mountain Lion. http://www.apple.com/osx/specs/