Hi A_Name_That_Is_Not_Taken
I am Dave, I will help you with this, try this fix.
Important - disconnect totally from the Internet
Open the Settings App (Gear icon on your Starr Menu)
Go to Update and Security - Activation
Click Change Product key
Enter this generic product key: VK7JG-NPHTM-C97JM-9MPGT-3V66T
When prompted, click 'Activate Product'
If the above does not work first time, restart your PC and try again.
Note the generic key will cause Enterprise to downgrade to the Pro edition, then restart (not shut down) your PC and the Pro edition should be installed.