If experiencing issues with GreenLight's account or license information the quickest and simplest approach may be to reset GreenLight to the 'factory settings' - as if it has been freshly installed.
To reset GreenLight completely we need to delete the entire Circular Software folder in the user application support folder.
The full path to Circular Software Application Support folder is your User Folder > Library > Application Support > Circular Software. Please note this is your USER folder Library which is different to your Macintosh HD Library.
To get this folder from the Mac Finder go to Finder Go menu > Go to Folder… and paste in
~/Library/Application Support/Circular Software