I just bought GSB on steam wanting to play campaign mode, as I saw advertised on this website, and also on the version my friend showed me. Now I find the game I bought is without campaign mode, AND it is not available to buy on steam. What’s up with that??? I don’t want to now spend more money to get what I was wanting in the first place!
Steam will not be adding the campaign DLC until after the new year, unfortunately. That’s their decision, not mine
You can buy the campaign direct and then just install it over you steam copy, if you install in the right place, it will work fine.