Compatibility Report

• Name of the game with compatibility issues: The Witcher 2: Assassins of Kings
• Steam AppID of the game: 20920

System Information

• GPU: RTX 2070 SUPER
• Video driver version: nvidia-driver 550.163.01-5.1
• Kernel version: 7.1.12+deb14-amd64
• Link to full system information report as Gist: cc65a
• Proton version: GE-Proton11-11

I confirm:

• [x] that I haven't found an existing compatibility report for this game.
• [x] that I have checked whether there are updates for my system available.

The game does not install, so no $HOME/steam-$APPID.log to attach

Symptoms

Running the GOG offline installer under the latest version of Proton results in an access violation error and does not compelte.
Using GE-Proton10-32 allows to install the software normally

Reproduction

1. Place the GOG offline installer setup_the_witcher_2_-_assassins_of_kings_enhanced_edition_3.5.0.26g_(64109).exe on a path physically on another drive (even if it is mounted under / or /home/$USER)

2. Run the installer using GE-Proton11-11

3. Before starting, the installer will throw an Access violation error (in my case at the address 7BF9F2D6 and write address 7BF90000).
   

4. Press OK terminates the setup.

[!NOTE]
Repeating the same steps using GE-Proton10-32 allows to install the software normally.