Hi, I just bought the DLC and there's no downloadable installer to download it in my library. Also the game version is not on par with Windows and Mac. Please fix it.

Yes please fix.

Also the attached screenshot show the quite confusing downloads panel. By default it shows "System: Linux" but the listed download links are a mixture of Linux and Window stuff. If you select some other platform from the System menu and then switch back to Linux, it will finally tell you that no DLC is available for Linux.

I talked with a Factorio dev on Discord. You can redeem the retail key that you got from GoG and put it into the Factorio website, and download the DLC from there.
First you have to go to More > Serial Keys to get the DLC retail key, and then you have to create an account on Factorio.com (if you don't have one yet) and in your profile, press "Input upgrade code" and paste the key. You should have now access to the latest build of the DLC on the website.

Question is do you get to download the base game too? You need 2.x for space age, it won't work with the old build..

EDIT: answering my own question. Yes, you can register both your base game and expansion and download both from factorio.com.

Thanks for the help!

Once you have registered your serial over at factorio.com you can download the base game + Space Age as a single package. No need to download them separately. The expansion download package includes the base game.

Where did you find a single package with both? For me it shows base game and expansion as separate downloads. EDIT nevermind.

Maybe I should buy it directly from devs, if I download it there anyway. :/

+1. Thank you!

Both installers (version 2.0.7 for base game + DLC) are now available. I didn't try them yet though.

If you use Lutris to manage your games, make backup, before isnalling dlc. Directory looks like mess, games just exists there in diferent subdirs. Space AGe canot see saves, seting achievements from normal game. Launcher needs to be created manualy.