You can update the license and product information in QuickBooks without going through the install/reinstall process. This is particularly helpful in instances when the number of your QuickBooks users are inaccurate because you use a single-user license for installation instead of the correct multi-user license.
You must edit the qbregistration.dat file to avoid uninstalling and reinstalling the product. Any typos or incorrect information saved in the qbregistration.dat file will prevent QuickBooks from opening properly after the edit. There are two ways to edit this file:
Through the QuickBooks common file
If the product number remains the same after editing the qbregistration.dat file:
If the information is still not updated after a reboot: