The previous text body of this post was on the slightly miffed side with regard to the hoops some have had to go through to get the stardock version of the installer to run.
Now that i have managed to get it working it would be unfair to leave this thread in it's previous state as i do champion the game itself i was just furious that we had all these arguments against giving compensated members STEAM keys and then it turns out the SD Download/Installer is a dog.
Aaaaaaaaanyways point being ... could i suggest you revert to the compression you used in beta or atleast just redo the file itself because it took 3 downloads and nearly 30mins of my machine going like a snail to finally get the consent screen to pop up only for it to disappear and nothing happen and on 2nd attempt the game has finally started to extract and install.
You are indeed a gem for offering 2 and a half years of effort to some of us for free there is no doubt of this BUT it's all a bit academic if on collection that gift is no more than a 3.5gig paper weight.
Please consider re-compressing the file at https://store.stardock.com/myaccount/products