This is a basic guide to using the mod within Proton (aka Linux).
Please make sure your game works in proton first, before installing this mod.

Enabling proton Experimental (Optional)

While this isn't a required step, it's useful for performance.
Right click the game in Steam and select 'Properties'. Go to the 'Compatibility' tab and tick 'Force the use of a specific Steam Play compatibility tool'.
In the dropdown, select 'Proton Experimental'.

Setting up the mod with ProtonTricks

First, follow the steps to install the mod. These are in the wiki.
Run protontricks 1091500 --gui, you may get an error saying "You are using a 64 bit WINEPREFIX", you can ignore this. Press 'Ok' when this error appears.
Choose the option 'Select the default wineprefix', then 'Run winecfg'. In the window that opens, select the 'Libraries' tab. In the dropdown on 'New override for library', select version. Click Add, then Apply and Ok.
You can now exit out of Protontricks and start your game. Check to see if the log exists after you run the game. If it's there, you've successfully installed the mod.
If you have issues with the mod still not working or the game just crashing, you can try this: re-open Protontricks like you did before, choose the option 'Select the default wineprefix', then 'Install a Windows DLL or component'. Tick vcrun2019 and press Ok. If a window pops up, then go through the steps to install that runtime (just click next really), otherwise just wait until the Protontricks screen comes back. Now exit out of Protontricks and try launching the game. DON'T do this without first checking if the mod works without this step, since installing vcrun2019 has been observed breaking game installs before, preventing the game from ever launching again and requiring a re-install.
NOTES: You will also need to install d3dcompiler_47 with winetricks to get it to work now, contribution on how to do this would be much appreciated!
If vcrun2019 breaks your install, it's been reported it can be fixed without reinstalling by deleting the contents of/steamapps/compatdata/1091500.

Setting up the mod with proton as non-Steam Game

Search for the game APPID with: $ protontricks -s name_of_the_game_on_your_steam_lib
$ protontricks -s Cyberpunk 2077
copy the APPID from the terminal then run:
$ protontricks "APPID" --gui
From now on, you can follow the Setting up the mod with ProtonTricks instructions.

Setting up the mod with Winetricks

For users running on the GOG version of the game, via launcher like Lutris, Minigalaxy or GameHub, those running from the direct GOG Galaxy Windows application through Wine, or those directly using the Game libraries, Protontricks won´t be helpful in your case, as Protontricks will notice that you don´t have the game on Steam.
Instead, use Winetricks in which Protontricks is derivated from.
Either run Winetricks in itself if you use your default prefix, or from your custom prefix via: WINEPREFIX=<Location of your WinePrefix directory> winetricks --gui via the terminal.
From now on, you can follow the Setting up the mod with ProtonTricks instructions. If you want to verify in Winetricks has correctly taken in account your custom Wine directory, click on Browse files to see if it brings you to the designated folder.

Thanks to