The devs haven't said anything about GOG specifically, just "PC", and the only Google results for "A Hat In Time Seal the Deal GOG" are an announcement page on GOG that seems to have been pulled shortly after it was posted, suggesting that it was posted in error. Is it coming on time, months later like previous updates, or not at all?

Good question, the DLC is coming out tomorrow.

Since GOG removed the news post shortly after it went up I got the feeling we'll be seeing it way later. I hope I'm wrong though.

EDIT: Never mind, the news post is back up and the DLC page is live https://www.gog.com/game/a_hat_in_time_seal_the_deal

The link is dead for me now.

News post is still up, so probably down till they switch to the live version.

Seems to be up now. I'm updating now. Have fun guys :)

Why is the download file so small? It's only around 5-6MB.

The install files got an update, so I guess the DLC-files are included and the 5 MB thing is only an activation file.

That explains the problems I been having.