I bought the JAVA version for my laptop and downloaded it, but when it launched it would only allow me to play a demo. It said I had to buy the JAVA version to play, even though I just had, and when I clicked "buy now" on the popup it just sent me back to the download screen with no purchase options or anything, so it knows I bought it. 

I made sure that the Microsoft account login was the same as when I bought it, so I'm not sure what the issue is. I tried deleting and reinstalling twice, it did not work.