Lightroom 6 : Signing loop

I moved this post thqt I put on the wrong forum.

Dear community,

Today as often, I clicked on the LR shortcut to work on my photo but instead of launching normaly, I had the "Adobe Phtoshop Lightroom 6 Sign In " pop up. Than it directly goes to the Phtoshop Lightroom 6 Trial window.

I click on License this software, put my Serial Number (bought in 2017) click on "Next" but instead of going to the next step, it reload the "Adobe Phtoshop Lightroom 6 Sign In " pop up.

I did not try to uninstall the software as I am not sure it will help and not sure I won t loose my catalog.

Any clue, on what happened? I was not ablle to find out how to get any support from chat or phone.

Is it because I bought a one time purchase version and that Adobe moved to a monthly fee model?

Thanks,

Chris