One last question on LR 6 non cc

I need some help. I have a macbook pro, bougnt LR 6 a few years back. Until recently I have never had a problem. Now I get warnings about the license and just bypass them.  So, as I read many places, uninstall, delete from trash and download new copy, from my disk. Got to the part of reinstalling from disk. Pit it in, nothing happens. Contacted Adobe and nope, can't reinstall. No way no how. Not supported by adobe or mac.  hiw can it go from working and Mac supporting it to that not being possible?? I was able to rescue my Lightroom program feom trash but no lrcat:(. So bummed out. I am not going to go to subscription when what I had was more than sufficient.  Any help avayat all?