Inexpensive upgrade from Windows 7 Pro to Windows 8.1 Pro

These links may be helpful to you if you have access to a Windows 8 product key, from MSDN or purchased via postcard.

NB: you should start from system running a legal, activated copy of Windows 7.  If it has not been activated, you will go through may steps and then get an error message that the download is not available in your region. 

General Information and Overview: how-to geek article  or c|net article

Microsoft guide to upgrading with a product-key - this can get you the initial Windows 8 ISO file, around 2.3gb: upgrade-product-key-only

In September 2014, this is where you can download a free evaluation copy of Win 8.1 Enterprise from TechNet: evalcenter

Screenshots for the Win 8 to 8.1 upgrade: pc-support article

Windows 8 product-key postcard; you have to upgrade to 8.1 yourself: Amazon $70

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