Here's how I've done: First you need to download ubisoft connect from the Ubisoft's website. Add the installation file to the steam as a non steam game and force it to run through proton (Mine was 7.0.5 while I was writing this). You should've installed the launcher without any issue. One it's done make sure to check the "run after installation" option in the installer and then hit exit to close it. If it's done correctly then the Ubisoft Connect starts. Log in with your username like usual and make sure to check "remember this device" option to store your login information. After a succesfull login close the program. Now, here's the tricky part: you need to search the installation folder manually in the .steam/steam/steamapss/compatdata folder and look through the Program Files(x86) folders. If one of them contains an Ubisoft folder that would probably the correct one. Now, rename that Steam id folder into 48180 and that's it. You can now download the Steam version of H.A.W.X. 2.

Here's how I've done: First you need to download ubisoft connect from the Ubisoft's website. Add the installation file to the steam as a non steam game and force it to run through proton (Mine was 7.0.5 while I was writing this). You should've installed the launcher without any issue. One it's done make sure to check the "run after installation" option in the installer and then hit exit to close it. If it's done correctly then the Ubisoft Connect starts. Log in with your username like usual and make sure to check "remember this device" option to store your login information. After a succesfull login close the program. Now, here's the tricky part: you need to search the installation folder manually in the .steam/steam/steamapss/compatdata folder and look through the Program Files(x86) folders. If one of them contains an Ubisoft folder that would probably the correct one. Now, rename that Steam id folder into 48180 and that's it. You can now download the Steam version of H.A.W.X. 2.