Hi JohnnyZ,
Please try these steps:
Close all of the Adobe processes from the Task Manager/Activity Monitor and go to the following locations:
MAC
Location 1: When in Finder, click on Go > Go to Folder > ~/Library/Application Support/Adobe
Location 2: Go > Go to Folder > ~/Library/Preferences/Adobe
Location 3: Documents > Adobe
WIN
Location 1: C:\Users\<Username>\AppData\Roaming\Adobe
Location 2: C:\Users\<Username>\Documents\Adobe
In all the locations, rename the 'Adobe' folders to 'OldAdobe'
Launch Premiere, accept the License Agreement and see if it works.
Note: You will lose your customized workspaces and keyboard shortcuts.
Thanks,
Kulpreet Singh