I now regret buying this on GOG
Or actually at all because hate DRM in any form (DRM = Digital Right Minimization).

Currently offline installer for Spirit of the Island - Adventureland is at version 2.1.0.1.1
That is almost a half year behind ??? !!!

Installing using galaxy I found the following info ( today is 7 april 2024)

versions
3.0.3 - 23 days ago
3.0.2.5 - 2 months ago
3.0.2.1 - 2 months ago
2.1.1.0 - 5 months ago
2.1.0.1 - 5 months ago = current offline installer ???!!

now looking at steams database here https://steamdb.info/app/1592110/patchnotes/

3 April 2024 Wed 14:38 Update 3.0.4.0 13937175
so even galaxy's latest version is apparently a bit behind
But I guess version 3.0.4 will show up in galaxy next week.
If so not a big problem.

!!! However the WAY OUTDATED offline installer is though. !!!!

notice on steam adventureland is just a normal DLC.and is not treated as a separate game.
One can see that here https://steamdb.info/app/1592110/dlc/