I am still quite upset about this. I was looking to install it for my son to play, nope.
Bastards.
What is the story here? Can you run it on a VM with an older Windows?
It's a Java applet, so it runs everywhere, but due to the migration from minecraft.net accounts to Mojang accounts, and the second migration from Mojang to Microsoft accounts, a lot of people lost access to the game.
I think some people who bought it long long before Microsoft purchased the company, are locked out, after some transition period