It seems that the game installer has been updated, but the GOG changelog is outdated.
What exactly happened and what was updated?

GOG removed the Universal Update patch in the download section for the game.

https://www.gog.com/forum/general/the_what_did_just_update_thread/post18911

Were I to guess, they may have integrated the patch into the normal installer or simply removed it because the normal installer was up to date enough to make the need to run the patch obsolete.

if I had to Guess...
I'd say they are going to "Update" EVERY Game buy Integrating the "GOG Galaxy Installer"...
so, I Doubt You'll see a ChangeLog...

if You did it Would look something Like This:
We Noticed a lot of People didn't want to Download and Install "GOG Galaxy"
so Now We're including it in Every Download...
You're Welcome ~ GOG

am I Right?
what did I Win?...

An Illuminati Badge made from reptilian skin. -_-