Try New Technology

Below are the basic steps:

1. In Steam use the “Add a Non-Steam Game to My Library…” to target the installer file (.exe).
2. Before launching the game, right-click on the game and select Properties.
3. Compatibility tab select “Force the use of a specific Steam Play compatibility tool” (doesn’t look like you can change this after the fact)
4. Close the Properties and run (Play) the installer. The game should fully install within Proton (D:OS2 DE had an error at the end, but still ended fine and runs).
5. Use the Properties menu again to set an icon (.png or ,tga) and name the game correctly (ie “Divinity – Original Sin 2 – Definitive Edition (GoG)”)
6. Enjoy!

EXTRAS:
If you need to access the “C” drive of the Proton install of this game the folder location will be in “~/.local/share/Steam/steamapps/compatdata/[appid]/pfx/”

• NOTE: If you need to put any save files inside of the Documents folder, then use the “steamuser” (ie “~/.local/share/Steam/steamapps/compatdata/[appid]/pfx/drive_c/users/steamuser/Documents/”)

If you need to load something else into the games prefix (ie DLC, Patch, etc.) then you can do the following:

1. In Steam use the “Add a Non-Steam Game to My Library…” to target the installer file.
2. Before launching the game, right-click on the game and select Properties.
3. Compatibility tab select “Force the use of a specific Steam Play compatibility tool” (doesn’t look like you can change this after the fact)
4. Close the properties
5. Open Properties again and this time add the following to the “LAUNCH OPTIONS” field: STEAM_COMPAT_DATA_PATH=”~/.local/share/Steam/steamapps/compatdata/[appid]” %command%”
6. Close Properties (mine wouldn’t close, but I could still click the Play button and the DLC installer I was running worked fine)
7. Remove the install from your Steam Game Library list

NOTE: This was on Manjaro KDE running the latest version of Steam. I would expect it to be mostly/exactly the same on other distros.

btop (Manjaro package page) – “Resource monitor that shows usage and stats for processor, memory, disks, network and processes.”

nvtop (Manjaro package page) – “Nvtop stands for Neat Videocard TOP, a (h)top like task monitor for AMD, Intel and NVIDIA GPUs. It can handle multiple GPUs and print information about them in a htop familiar way.”

NOTE: I will update this list as I come across more tools.

Running on Manjaro KDE
Using Heroic Game Launcher (flatpak)

ISSUE: When installing Divinity: Original Sin 2 – Definitive Edition from GoG with the Sir Lora DLC the game would download and install then launch as the non-Definitive Edition version. The issue here was that my previous saves would not work since they are from the Definitive Edition of the game.

SOLUTION: Install from Lutris following the instructions to install the Sir Lora DLC. D:OS2 – DE installed the first time and the DLC loaded as the guide said it would. At this point my saves worked fine.

NOTE: Save file location is: ~/Documents/Larian Studios/Divinity Original Sin 2 Definitive Edition/PlayerProfiles/

At this Point all GoG games are installed via Lutris and Epic Game Store (EGS) are installed via the Heroic Game Launcher (HGL) on my system.

Suddenly Yakuake (Manjaro KDE) would only open on the screen with the curios on it. When trying to force the Screen options it would just uncheck what I select and keep following the cursor. If I forced it’s location with Windows Rules it would go to the screen and location I want, but would act oddly.

This is a CONFIRMED bug 383555 with kde.org

Quick workaround was to set the Resolution Scaling to 100% and then it will work fine for me. Others have reported deleting certain files might also work.