PLEASE HELP!! Need to reinstall Premier Pro CC 2015 and it's not supported!!

[#1]

The audio and video for some very, very important work of mine is all out of wack when I try to import it to later versions of PP CC.  It all started when I logged out of CC and tried to log back in.  It simply wouldn't let me in for the longest time, and now it won't let me open CC 2015 at all without reinstalling, and CC 2015 isn't even supported by Adobe anymore.  Can anyone help me out?? 😞 Thank you.