You'll need to download and ISO and create installation media You can run an upgrade install, but a clean install will be more trouble free. Your key can be used either way. If your win 7 is 32bit X86 and you'll want 8.1 to 64 bit X64 you will need to clean install. http://www.eightforums.com/tutorials/?filter[2]=Installation%20and%20Setup
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