The Lightroom license I have that is listed within my Adobe account has been revoked as I found when i tried to change laptop. The on-line subscription product is of no interest as I go travelling for many weeks at a time photographing African wildlife.
Thank you both. Bizarrely it suddenly decided to open the program and appears to be working, although it has lost the links and settings that I had built previously. However I am not going to complain as I am hugely relieved!