TS2986: OS X: Cannot install on a volume used by Time Machine for backupsLearn about OS X: Cannot install on a volume used by Time Machine for backups
Currently Being ModeratedNov 13, 2012 10:20 PM (in response to vinayaka.m)
Step one is to purchase a redemption code usable at the Mac App Store. Get it from Apple's online store's telesales agents: 1-800-MY-APPLE (1-800-692-7753) or Customer Service and Sales Support at 1-800-676-2775. Then, launch the MAS, click on redeem, and follow the instructions.
BTW, do note that no PPC apps will run and that the ill-designed installer deletes itself during installation, so when it finishes DLing, quit it, put a copy in a safe place, and then relaunch it. That saves resources; no wasting of bandwidth, time, and electricity DLing it again if something goes amiss or you have to restore it. Finally, the latest version is 10.7.5 and that's what you'll get at the MAS.27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.2), G4 450 MP w/Leopard, 9.2.2
Currently Being ModeratedNov 13, 2012 10:23 PM (in response to vinayaka.m)
Delete the Backups.backupdb folder on that hard drive before installing
Currently Being ModeratedNov 13, 2012 11:43 PM (in response to vinayaka.m)
You must have Mac OS X 10.6.6 in order to install Lion. Download it from MAS and install it. It's easy.
Currently Being ModeratedNov 14, 2012 5:53 PM (in response to vinayaka.m)
You'll need to install Snow Leopard first. As far as I know, there isn't a way to install Lion or Mountain Lion without either a Recovery HD partition, Internet Recovery (which your Mac probably doesn't support), or having Snow Leopard 10.6.6+ installed.
The Lion USB installer may work, but I don't know, and I'm not sure you can get one anymore.
Once you've installed Snow Leopard and updated it, you can install Lion from the Mac App store using the Redemption code baltwo discussed.