I bought Grim Dawn with all the DLC on GOG.COM (and I have around 40 hours on gog), and now I realize I had everything on STEAM and didn't know Lol ... :
Grim Dawn – I finally got to play it (Update: Now with XP fix for the GOG version!) – The GAT at XIN.at
Grim Dawn Definitive Edition now available on Steam! - Announcements and Information - Crate Entertainment Forum
Buy Grim Dawn GOG.COM Key GLOBAL - Cheap - G2A.COM!
Buy Grim Dawn GOG.COM Key GLOBAL - Cheap - G2A.COM!
Play with friends although not everybody has the expansion(s) - Guides and Tutorials - Crate Entertainment Forum