I’m using Office Professional 2007 Trail on a Tablet laptop. Yesterday I bought a full version of the same office suite with product key. Now as my tablet doesn’t have CD drive, I cannot uninstall the trial and re-install this purchased version. Hence I tried converting my Trail office to Full version using the product keys I bought but it says “Product Key is invalid.”
Any idea why is it so? Any alternate method to activate the same?
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