MarkoH01: As promised I tested the Dying Light DLC issue. For those who are interested, here is the result:
For the remaining DLCs from Dying Light to be installed you don't need Galaxy at all. That is all good there is to say to it.
If you install the game using the offline installer and start it offline you will see 8 DLCs listed.
If you install the game using the offline installer and start it online you will see 13 DLCs listed.
Go offline again and start it again and the DLCs will be missing again.
Without being online while starting the game it is not possible at all to access the remaining DLCs. The game simply seem to behave different the moment you are going online. MarkoH01: Further testing of the Dying Light issue - new results:
I made a mistake in testing - you need Galaxy to be able to go online (for proper testing the Galay service needed to be disabled). Sorry for wrongfully telling that Galaxy is not needed.
It seems as if it is possible to access those DLCs after going online once even though the DLCs are not listed anymore. See
here for more details.
EDIT: Bloody broken forum. Let's see if I can make this post humanly legible.
Back when the
fresher, better GOG rolled out,
I had commented on the, then added, "DRM-FREE. No activation or online connection required to play" bit on game pages as a possible sign of what may come down the road in terms of requirements during installation.
Back then, Destro was pretty quick to
give reassurances that it was purely a wording thing, that the GOG Galaxy client was optional, and that nothing had changed regarding GOG's understanding of DRM and the way standalone installers work. He did deem it necessary, however, to point out that most GOG users don't know what DRM-free is, which read as implying that they don't care.
I replied to his post a bit further down the thread, never to hear from Destro, or anyone else representing GOG, again.
A few others had also chimed in - the whole discussion is just a few posts long, from post #1670 up to #1687 (with a handfull of unrelated ones in between), for anyone interested.
Note that Destro was smart enough to talk only about the, at the time, present, and gave no reassurances, nor made any promises for the future. A few years down the road, and it looks like my concern/suspicion wasn't unfounded after all.