Need activation code for 2019 after I already activated and filed last year...CD GONE

I needed to pull up my 2019 return to see what I had entered from the prior year (it wasn't reported on any documents because I used a std deduction). I attempted to go back into TT2019 (I had never uninstalled it from my computer), and it asked for my activation code. What???  I don't have the CD anymore, it got thrown away after I filed!  Had I known I was going to need it again any time in the future, I wouldn't have thrown it away!!  How do I get back into TT2019 now????