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Possible Duplicate:
If I’m performing a an upgrade to Windows 8, do I have to have the previous version installed, or is just having the key enough?
I'm planning to upgrade to Windows 8 Pro.
I want to know whether or not will I be able to use the Product key I get from upgrade of $39.99 for a clean install later without any hassles?
In other words, is the upgrade key complete in itself for clean installs later or are there any conditions attached?