Why would anyone wanna pay for a M$ product again knowing that they simply cut a product hot? I don't know about everyone else but I wouldn't go near a company that could one day just "cut me off" of my dependable services (M$ OS versions, software packages, and etc).
Then you would have to not go near Nintendo because they do stuff like this all the time. They've been doing it a lot more recently.
To download the other ones you need to make a folder in the versions folder for minecraft and put the client and JSON file for the versions in there. They all need to be named the same aside from file extensions. Once you do that, you will be able to choose that version when making a new profile with the minecraft launcher.