A step-by-step guide on how to run Heroes 5.5 on Steam Deck

Since I don’t own STEAM Deck, I can’t verify the functionality of this guide, but if anyone has it and manages to install Heroes 5.5, be sure to send photos.


  • Install HoMM5: Tribes of The East on Steam Deck
  • Start the game once, so proton compatdata folders are created
  • Install Protontricks from the Discover store
  • Download Heroes 5.5 mod on Steam Deck
Might & Magic: Heroes 5.5
Heroes 5 Bundle GOG (works with this version)
see discord server for large database of compatible maps (most maps from maps4heroes.com have to be edited to work properly)

Steps to configure:

  • Open terminal (Konsole) and run the following commands to create commands aliases:echo “alias prot” >> ~/.bashrc echo “alias protontricks-launch=’flatpak run –command=protontricks-launch com.github.Matoking.protontricks'” >> ~/.bashrcNote: This step is optional, it’s going to create commands aliases, so instead flatpak run –command=protontricks-launch com.github.Matoking.protontricks you can do protontricks-launch
  • Restart the terminal so that the above aliases take effect
  • Create the game folder inside the compatdata directory, so that the installer can find it:ln -s ~/.steam/steam/steamapps/common/Heroes\ of\ Might\ and\ Magic\ 5\ Tribes\ of\ the\ East/ ~/.steam/steam/steamapps/compatdata/15370/pfx/drive_c/
  • Start mod installer and when it asks to select the game directory, find it in C:\Heroes of Might and Magic 5 Tribes of the Eastprotontricks-launch –appid 15370 ~/Downloads/MMH55_RC17g.exe
  • Browse the path of the game:cd ~/.steam/steam/steamapps/common/Heroes\ of\ Might\ and\ Magic\ 5\ Tribes\ of\ the\ East
  • Backup original exe:mv H5_Game.exe H5_Game.exe.backup
  • Set MMH55_64.exe as default one:cp MMH55_64.exe H5_Game.exe
  • Launch the game from Game Mode.

– Game start fails with error “Failed to set display mode” – Game is probably launched in desktop mode which is not working. Try running it from Game Mode. If you manage to make it run from Desktop Mode please provide us the steps so we can update the guide.

Source: https://www.moddb.com/mods/might-magic-heroes-55/tutorials/mmh55-running-mmh55-on-steam-deck

Heroes 5.5 is an unofficial expansion pack for Heroes 5 Tribes of the East (standalone) or HOMM5 Complete. The pack will include many new adventure objects, new larger battlefields, new heroes, new classes, new specializations, new skills, new artifacts, new adventure spells, new HD textures and a greatly improved RMG with more than 60 ‘visualized’ Templates. The AI is much more intelligent and calculated much faster. Balance is also greatly improved both for small competitive multiplayer maps as well as crazy XXXL maps with countless epic battles vs Neutrals and AI.

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