HT1338 can i upgrade my mac os by downloading on the internet?

CAN I UPGRADE MY MAC OS BY DOWNLOADING ON THE INTERNET?

Open the Mac App Store and try downloading Mavericks. If you get told it's incompatible, choose About this Mac from the Apple menu, check if the computer has at least a Xeon or Core 2 Duo(not Core Duo) CPU and 2GB of RAM, and if it does, click here and order a download code for Lion 10.7.
Back up your data before upgrading. Mac OS X 10.7 and newer don't support PowerPC programs such as versions of Microsoft Office prior to 2008.
(104810)

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