Like many I experienced random crashes 20-30 minutes into my playtime despite the game running very well... but i figured out the fix! In desktop mode, find 'proton experimental' in your steam gamelist and open properties. Go to Betas and select 'bleeding-edge-latest and untested dxvk, vkd3d-proton and wine changes; backup your prefixes before using'.

As suggested, this will alter your prefixes that you may use on other games; but since doing this the game runs absolutely flawlessly with no crashes. This is because this version of experimental utilises dxvk, which blacklist uses.

Of course, make sure you then select and use 'Proton experimental' for Blacklist itself otherwise nothing will change.

DLC RESTORE

I recommend the below link to restore the missing DLC since ubisoft blocked access to it.

https://www.nexusmods.com/splintercellblacklist/mods/25?tab=description

The save files are located at the following location in dolphin (steam version)

/home/deck/Desktop/compatdata/235600/pfx/drive_c/Program Files (x86)/Ubisoft/Ubisoft Game Launcher/savegames/a5b7001d-ea9b-4255-9e66-245aa92ef64c/449/

This may differ for you for whatever reason, but this is where I found it.

Simply replace the files. Back up your previous saves if you want.

Upon replacing the save files, the dlc will be restored. And yes, you can play the game with the DLC from the beggining after loading up and hitting 'Restart story' in the pause menu settings (While in paladin).

As for multiplayer / Co-op it simply doesnt work anymore, not even splitscreen like on the console versions of the game, a real loss. PS: Sometimes the game works 100% completely offline, but this is tempremental, it may or may not ask for your ubisoft connect password; anticpate that you might need to be online on the inital game startup, afterwhich disconnecting/ going into sleep mode shouldnt matter.

Enjoy the game!