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Windows 8 Pro Upgrade Download
You can download an upgrade to Windows 8 Pro for your PC running Windows 7, Windows Vista, or Windows XP with Service Pack 3 (SP3) for an estimated retail price (ERP) of $39.99.
The promotional price is limited to one upgrade per PC and a maximum limit of five upgrade licenses per customer.
This promotion is available beginning on October 26, 2012 and runs until January 31, 2013, inclusive.
Each upgrade license applies to only one PC and you can install the upgrade only on PCs that have a valid base license and one of the following operating systems: Windows 7, Windows Vista, or Windows XP (SP3).