I have the Minecraft Pocket Edition on my phone (bought) and now I wanted to download the Windows 10 Edition. But in the Microsoft Store I have to either buy it for 26.99 euro or I can try it for free. Is it possible that I register somewhere with the account with which I also bought the Pocket Edition and can then download the Windows 10 Edition free of charge?
The versions are compatible, but the Google Play Store has nothing to do with the Windows Store. These are 2 different companies and logically they both want you to buy the game from them.
If you don't have friends who are playing the Bedrock version I would recommend the Java version.
But you can buy a Minecraft 10 Windows key, you can get it for 2-3 euro.
No it's not possible
You can't but you can buy a key from instant gaming and it only costs 5 euro