Here is how you can find it.

• First, in Steam, go to Settings -> Storage. There you can see the path for your library.
• Click … icon and select Browse Folder
• Open compactdata folder
• Open folder 3119540 (3119540 is Steam ID number for Scriptorium)
• Open folder pfx
• Open folder drive_c - this is emulated C drive of the game
• Most probably pictures are in users/steamuser folder somewhere

You are trying to install wrong versions of nvidia drivers and proton app.

For nvidia, use this https://linuxconfig.org/how-to-install-nvidia-drivers-on-ubuntu-26-04

For proton vpn, I assume you are trying to install app meant for 24.04. Do not do that, just search one for 26.04, if it is available.

I really hope Link is going to break some pots.