As @bkm has clearly stated, I don’t think we will see ERPNext for Windows.
As you have mentioned there’s docker and WSL. WSL is Microsoft recognizing the importance of the Linux ecosystem fact that many important and useful Software (like ERPNext) won’t be ported to their platform. And they want their users to be able to work with said software, and not go away from their OS. I’ll recommend getting used to WSL or Docker, they are quite useful, and not that resource heavy in a current gen computer! Good Luck.
For version 13 demo, I don’t think there’s, but to try ERPNext you can try the official demo and I’m sure once 13 is released you will be able to test it in the same place.
If you want to try it right now @revant_one has done amazing work on the docker installation is easier than ever, you can spin up something really quick.
Or event faster check this out, you can try version 13 using this: