I don't have the game on steam so i can't offer any help for now ,Only if you bought the game developers website i can offer you help .
Actually, if you bought before 26-May from developer website, you can get a free steam key. I got one.
Here is the exchange page on everism's official site, you just go to game menu on steam and select activate a product on steam then enter the exchange key eversim give you there.
http://www.eversim.com/acx/acx.php?steam=1
I have both editions now steam and not steam. Only option I miss having is infinite manpower. You know under (industry, building and roads, you have around a hundred thousand workers, and this is always where I suffer, I end up with zero available workers, and trying to increase them doesn't work). It used to work on previous gps version using memory editor. Now it just changes the value right back, like it is being calculated from something else). and without workers you can't build anything