Hmm, even though I do have AI War with all DLC on Steam I cannot claim the game on GOG. Anyone else with this problem?

Same here...

I don't have AI War, but It's not detecting Tempest for me, and I have that. Refreshing didn't solve it.

EDIT: Nevermind, it worked now.

I also own AI War and all DLC on Steam, but not detected on Connect? Can anything be done?

Same here. I own Subid 49306. It could be trying to detect 28606, but that's the older 2013 package.

I'm assuming the issue is that GOG is not able to detect ownership of specific packages. There is no public access (not even via API) to see that, it's considered private data.

Unless GOG has some special non-public access deal with Valve, afaik GOG can only verify what's listed in the public Steam library listing
http://steamcommunity.com/id/[yourIDhere]/games/?tab=all
and ownership of only a handful of DLCs can be detected that way.

edit: now that they added it back, the result seems to be:
in order to redeem AI War Collection via Connect, you only need to own AI War: Fleet Command basegame, it doesn't matter do you own the DLCs on Steam or not.

I checked just before leaving from work about half an hour ago, and was having the same problem. Now I just arrived home and it's fixed! (for me, at least)

Thanks for sorting it out so quickly

Thanks for the quick fix, it's working now. :)

thanks Thiev