Is there a way to change something where you can continue to run an old version of ProgTV where installing updated versions won't overwrite your old version? I know I can run the Beta and the main one but I want to pick a version that I think is stable and have it as an option besides the newest one.

I'm using the newest version of Fire TV but I expect it to be the same as Android.

You can install stable and BETA version in same time. These versions are intended by settings.