Please post a screen-capture of the error appearing.
[moved to the LR CC forum]
This indeed fixed the issue. The only thing that was left was to relaunch the Creative Cloud app and recheck for app updates to update the Trial button issue.
I think it'll be a really good thing if you make sure your Technical Support agents are more aware of things like that. Today I spent more than 50 minutes and at the end (seeing the chat won't lead to anything) decided to fix it myself and found this thread.
We're really sorry for all the trouble caused you. We will definitely pass your feedback to the concerned team so that they can keep such articles handy.
Thank you so much for your patience with us.