Linux support appears to be missing. Please seriously consider fixing this issue.

I agree.
There are only Windows and Mac installers, I'd like to see a native Linux version.

Still bug is present ;-)
Btw. What are the hardware requirements ?
Can someone successfully launched it from Wine?

Linux OS: Puppy Linux
Wine 1.7.24
setup_the_witcher_adventure_game_2.0.34.39.exe

Game crashes when trying to run setup file using Wine.

Used innoextract to extract game files.
Tried to launch "TheWitcherAdventureGame.exe" from within extracted directory, produces error:
"Unable to load mono library from "Z:/initrd/mnt/dev_save/in_use/apps/app/TheWitcherAdventureGame_Data/Mono/mono.dll" (error = 126)."

I got farther along with the tips in another thread:
http://www.gog.com/forum/witcher_adventure_game_the_online_beta/witcher_adventure_game_on_gnulinux

It'd be great to have Linux support. Hopefully it's comming ..