I bought Minecraft a long time ago. So around 2011-2012. How can I play the Minecraft Windows 10 version now, do I have to buy it again? Wanted to play crossplay with a friend who plays on the Ps4.
No, you don't have to buy it again. Go to the Mojang or Minecraft website, there are download links for people who have already bought the game!
Normally you would have to find a code on the Minecraft.net page when you are logged in, with which you get the bedrock for free, unfortunately I don't know how exactly, I bought it around the xD