hi, i'm playing on Mac and the game runs really well, the big issue is that i can't go online, i've seen on other forums that this game can launch an offline and an online version. looks like i always go offline cause it wont let use de arena or online menus when i play.
i tried a lot of things like restarting the macbook or closing and launching gog again, even launching inside gog and outside from the app of the game but it looks like it can't go online i even went to the preferences and gave permision to the game and to GOG but i don't know what to do anymore so i post this with hope that we can fix this together so many more people can play this game with friends

I would like to know this as well!

I have this same problem. On macOS the multiplayer button is disabled (gray color), but on Windows it is enabled. So I play it on Windows 10 by BootCamp and works well ;)