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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.