There have been two reports of an update for LR6 uninstalling LR6 from their computer and installing a CC subscription program. In order to restore they have had to subscribe to a 7-day free trial.
If this is not just an accident I think Adobe may need to be prepared for a class action. It certainly is becoming a company I would be loath to deal with.
"Anybody using Lightroom 6 stand alone version beware if the Adobe Download manager indicated that you have updates. I ran the update last night and the update decided to uninstall my Lightroom 6 and and install Lightroom CC. If you then try to log into Lightroom it now demands a Subscription or a 7 day trial, thus preventing you from getting your images."
" Yep sneaky sods... same happened to me ... been waiting for an update to LR6... it finally arrived NOT... hit update and I'm now a $17.56/ month contributor... for Classic CC... at least Dehaze is built in now"