Error message: "Deactivation failed. Revocation is either complete or revocation proof is already uploaded."

My main computer is dying, so I need to deactivate the license so I can move it to a different computer. But every time I try I get this error message above. What is "revocation"? I also tried doing it offline but never got anywhere with that either. The computer is so bogged down that doing much of anything with it takes literally hours. I am writing this on my backup laptop. I'm wanting to move the license to a Windows based backup laptop. (I normally use a Mac with Parallels.)

Thank you for your help!

Ruth Krawczyk