https://support.quickbooks.intuit.com/support/Articles/HOW12406

Close QuickBooks if it’s open.
Open the entitlement data folder for your operating system and version of QuickBooks.
On your keyboard, press Windows  + R to open the Run window.
Enter (or copy and paste) the following information, and then press Enter
QuickBooks 2105 and Enterprise 15.0: C:\ProgramData\Intuit\Entitlement Client\v8
QuickBooks 2014 and Enterprise 14.0: C:\ProgramData\Intuit\Entitlement Client\v8
QuickBooks 2013 and Enterprise 13.0: C:\ProgramData\Intuit\Entitlement Client\v8
Right-click the EntitlementDataStore.ecml file and select Delete.
Click Yes to confirm you want to delete the file.
Open QuickBooks, open your company file, and follow the instructions to register the application.
KB ID# HOW12406