Licensing issues Migrating Acrobat Pro 2020 for Mac to new a Macbook Air with Sequoia 15.5

Hello all,

I would apprciate any assistance with a licensing issue I am having when "migrating" and existing Acrobat Pro 2020 for Mac license to new a Macbook Air (M4) with MacOS 15.5 (Sequoia).

I have succesfully downloaded and installed the package from my Adobe account onto the new Mackbook Air including entering the serial number. When opening Acrobat, it begins to open an Acrobat window then immediately changes to a completely blank "Acrobat Licensing Application" window and hangs there and that is as far as it goes. 

I have tried many of the suggeseted fixes for similar problems, eg fully unistall and reinstall (several times), tried different download packages (not the flat package however), deleted the OOBE folder and restarted...

I would be very thankful to any help you may have.