You'll need a Microsoft account to download Minecraft but that's no sweat to do. Choosing between the two versions, Java and ...

Install all Minecraft versions (Bedrock Edition, Java Edition, Education Edition, Classic) on Chromebook (ChromeOS), with or without Linux by following these instructions.

Run Minecraft Java on your Steam Deck with my straightforward step-by-step guide, using Prism Launcher to keep things simple.