Update says it has a 64 bit version now. How do you launch it in GOG?
Starting the game through GOG Galaxy will automatically launch the version that is compatible with your OS.
If you run a 64-bit OS it will launch the 64-bit version.
If you run a 32-bit OS it will launch the 32-bit version.
If you wish to launch a specific version, bypassing the automatic GOG Galaxy launch, then you can create a shortcut of either the "Grim Dawn.exe" located in the "Grim Dawn" folder, for the 32-bit version of the game,
or the "Grim Dawn.exe" located in the "Grim Dawn -> x64" folder path, for the 64-bit version of the game.
There is an option of adding a "Command Line Argument" by going to your GOG Galaxy library (if you use the GOG Galaxy desktop application)
-> clicking on the game
-> clicking on the "MORE" button
-> on the dropdown list clicking on the "Settings" button
-> checking the box of the "Custom settings" entry, under the "CONFIGURE GAME" section.
Unfortunately I do not know what the appropriate command would be, but you could seek help in the official Grim Dawn forum found here; http://www.grimdawn.com/forums
excellent post - very informative and concise. highly recomended - thank you on behalf of all the other, eerm, idiots :p