trying to play minecraft modpack on twitch but unable to update minecraft native launcher

To be able to launch directly from Steam: go to the Games menu up the top -> click add a Non-Steam game and then find PolyMC in the list.

Click Add Instance in the top left, then pick either normal Minecraft or find some mods with the built-in search and it installs everything you need for you.

Ensure in the PolyMC Settings that Java is set to the latest version, which is needed for the latest Minecraft.

Otherwise, loading in Game Mode / Deck UI on Steam Deck it will flicker between the two windows.

Go into the main PolyMC Settings, click Minecraft in the left panel and click the option to close PolyMC when the game window opens.

It supports both Mojang and Microsoft logins.

Launch PolyMC and add your account in the top right corner.

Install PolyMC from the Discover Software Centre on Steam Deck, or Flathub directly for desktop Linux.

You will find this video also on the Steam Deck section of the PolyMC Wiki!

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Trying to play minecraft modpack on twitch but unable to update minecraft native launcher