I have used this solution in two different situations when I changed hard drives in computers by imaging the old one. I ripped it from here for the sake of preserving knowledge. I don’t trust Intuit.
If the encrypted file containing your licence number and product code is damaged, QuickBooks will not open, and might display an error message. In those situations, deleting the entitlement file and reentering your license and product information may resolve the issue.
To rename the entitlement file (QB 2013):
Thank you IntuitVince
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