Since I have installed LR6, it has been a constant battle to keep this program running. It was paid for in full through the Adobe web site, but it keeps reverting back to a trial and expiring. I have signed back in a few times and kept it going but this time it is giving me some error messages about certain files it cannot find and I cannot get back to the page where I can sign in. Great program when it works... Any ideas?
Some steps to follow:
Google the error messages. May be they are related to some software recently installed.
Uninstall an reinstall the software. Then do this: How to convert a Lightroom CC trial to Lightroom 6
Contact your Adobe support.
If you want to get qualified help from this forum:
Post the OS and version.
Post screen copies of your error messages or post the exact messages as text.