Hmmm, I definitely updated them last year, and am downloading the correct version (0.11.0.23) when I download via GoG. I assure you, I am not avoiding updating GoG, and am happy to try and resolve this issue. Are you playing on Win, Mac, or Linux? Maybe there's something funky going on with the installer on those platforms I can look into.
As for playing offline, you don't need an internet connection to play. Whether you got the game from Steam, Itchio, or GoG, you can play by just running the executable from the location you installed it to.
That said, if it continues to have troubles, you should be able to request a refund through GoG. I have zero control over refunds.