You may need to change the license and/or product number of QuickBooks Desktop for one of the following reasons:
QuickBooks Desktop for Windows
QuickBooks Desktop (change the license number only):
Note: If old product number remains after performing the above steps:
If the license or product numbers have not changed after updating the qbregistration.dat file, it will be necessary to restart your computer and verify the information again. If they are still not updated after a reboot, you will need to perform a clean install of QuickBooks.
QuickBooks Desktop for Mac