Kickstarter backers have already downloaded the GOG version of the game. See GOG's forum; the issue was GOG wanted to delay the general release of D:OS until GOG Galaxy was ready; they have since changed their minds. Getting that organized will apparently take a couple days.
Why don't you get your shit together Larian. The GOG dev posted that DOS won't be available for download for a few more days.
Please allow me to correct you :
Why don't you get your shit together GOG. The GOG dev posted that DOS won't be available for download for a few more days.