Why cant I login to my LIghtroom 6 anymore?

I used to be able to use my purchased lightroom 6.  Havent used it in a while and now after asking to be logged in 20 times it does nothing. Now it locked me out as well.  I have my password, have my previous purchased serial number and entered that. It still wont work.  I dont want to update to the cloud and all of that.  Want to use the old version that I had access to and was fine with. 

My mom passed away 2 days, ago. Wanted to update a few pics and add to her photo collage.  Login 20 times, put the serial number, it locks me out.  Try to contact customer support its a stupid AI bot that does nothing.  So much new technology and nothing works, cant even get an email from adobe as it says I dont have an active account, yet I am logged in and it shows my previous purchases.  Such crappy support I cant believe it.