Enter your product key
Windows 8
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To access do the following
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Click I already have a product key
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Enter your product key
Make sure to enter the new product key you purchased to add features and not the one that came with your PC or current copy of Windows.
It looks similar to this:
Product key: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
Enter your key in the box provided (Dashes will be added automatically)