Old or conflicting licenses can cause issues. Navigate to %APPDATA%\think-cell\ and rename license.lic to license.old , then re-enter your key.
(Type this into File Explorer: C:\Users\[YourUsername]\AppData\Roaming\think-cell ) how to check think cell license key install
This is the fastest way to see if think-cell is licensed. Old or conflicting licenses can cause issues
think-cell license info