This is How you Downgrade Horizon Zero Dawn on Linux.

Download HZDDowngrader

Someone made it really easy to do just Download.
https://github.com/PercentBoat4164/HZDDowngrader
Unzip it.
Ensure you have these programs available on your Linux distribution: unzip, wget, basename, dotnet, md5sum (the only one you are likely not to have is dotnet; you can install it with 
snap install dotnet-sdk --classic --channel=latest/edge

Edit HorizonZeroDawnDowngradeScript.sh

Open HorizonZeroDawnDowngradeScript.sh with an edit programs like notepadqq.

And edit the top line.

To where you have your game if its in the main folder like .steam, then it has to look like this

HORIZON_ZERO_DAWN_DIRECTORY="$HOME/.steam/debian-installation/steamapps/common/Horizon Zero Dawn"

and save the file.

Execute the file.

Now make the file execute
by right click on it and properties

Open the terminal and say CD (link to HZDDowngrader-1.1 Folder) and push enter.
now say 
Sudo ./HorizonZeroDawnDowngradeScript.sh

and push enter.

You will be prompted for Steam username and password as well as the 2FA code two times.

Then it will do the rest for you.

Just start the game, and it should work.

Thanks to Kiba Snowpaw for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.

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