FYI -

I was puzzled by an apparent missing patch (it would have been 1.3.1.5 to 1.3.0.4). However, it seems that GOG made an error in thier numbering in the list.

I patched from 1.3.0.3 to 1.3.1.5 (which was actually 1.3.0.4) then tried the 1.3.0.4 to 1.4.0.0 update and it worked. This is the preparation for Star Kings and includes the Empire gameplay, even if you don't have the dlc's. I think it is called the triceratops patch.

Anyway, you can read 1.3.1.5 as 1.3.0.4 for the purposes of updating manual patches.

I hope that saves some confusion, and saves some people having to redownload and reinstall the whole game.

(Edit: misnamed the patch)