So I redeemed the code for Minecraft windows 10 in 2017 and I wanted to download the game today (2019) but I can't find the download link. I looked at microsoft store, mojang, Minecraft.net but I can't download anything there and then it will be there "Buy" and if I want to redeem the code there's of course "code has already been redeemed" use. How can I get the game now? How can I download this now?
You must log in to the MS Store with the same Microsoft account where you have redeemed the code. For most this will be the login of Windows itself.
Then you can download the game in the store. Just search the store for Minecraft.
If you have activated the game on the Mojang site you can just go to demo / download and download the game and log in with your data. If you have activated it in the windowsstore you have to download it with the same account you used to activate it.
I only use one account and still I Can't DOWNLOAD THE GAME!