I purchased and installed Windows 8 some time ago and then upgraded to 8.1 via the Windows Store.
When I got the upgrade I saved the ISO file in case I needed to reinstall.
At no time did I receive a different product key for the store version of 8.1 and now that I wish to reinstall I find that my original Windows 8 product key doesn't work.
I ran Belarc Advisor which shows that I do indeed...
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