There are two messages that say there's a new improved launcher. When you click on the link, it brings you to the Microsoft Store. That's when you're done. It shows some information about the launcher, but there's no way to get it. There IS a "Redeem a code" button, but since there's no code, that's the end of that.

There are four buttons below that show what it's included with, but none of them are what I have (simple Minecraft Java edition.

NOTE: I can't find a version number that matches anything in the list, so I chose 2.2.7265 (Windows) simply because it said Windows.