I'd prefer not to see any promotional content when installing games. I currently don't need (nor want to install) Galaxy as none of my games have online features.
The installers can also advertise games which have been removed from GOG as the data is local, and infrequently updated.

On Linux I managed to achieve this by running the installers in "non-visual" mode, but I've entirely forgotten the process.
Windows is my main operating system for now.

Set the timer bell on pc for when the game has installed.

Seriously, close your eyes. Or take a napkin and cover that part of the installer that shows ads. I mean this is something that takes 20 seconds max and only happens once per game.

You can't, unless you repack the installers. Those ads are images embedded in the installer.

April 1st is still a month away.

As mentioned, they're built into the installers. An easy way to not see them while the game is installing is to do something else. For instance, open a browser window and screw around on youtube while the installer is doing its thing. Basically, do anything else other than watch the installer do its thing. Like, literally, ANYthing else.

Myself, I would go to the forum and start a thread about this weird thing I discovered in my library, where the games aren't properly organized alphabetically. I bet nobody has heard about this so I should probably let y'all know about it.

Jokes aside, opening a window of any sort on top of the installer will keep you from having to watch the adverts. They'll still be there, but you won't see them.

We sure it's not an RRS feed delivering those things? :)

I just think it's weird that they're hard coded. You would think that someone on staff would have thought leaving them open so they could push out new adverts like for current sales would have crossed at least one employees mind. We talked about this a few days ago. Maybe someone could provide a link to the thread since I'm going out the door.

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you can't. the worst part about it for me is the amount of screen space taken. atleast gog should create a multigame installer tool so it silently installs all the games you want while minimising screen space. some of the adverts are not suitable for children. i was installing witcher 3 non goty and some of the screen shots were thoughtlessly put in

I don't mind that advertisements, it's the telemarketers that piss me off. :D

Just activate your screensaver and wait a few minutes. You've still got flying toasters over there, right?

Try running the installer from the command line and adding "/nogui" to the end of it (without the quotes, but with the slash).

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I'd love to go through the installer(s) and optimize some of the images, replace them, or remove unnecessary dependencies (DirectX 9 installers, which are 100mb) and optimize compression.

I tried to do just that, extracted the files, then went to re-build it using innosetup, however one of the files for the scripts was missing... or i missed something. I'm not sure. This was a few years ago...

People have cried "GOG is introducing DRM!!" for far less than that. Can you imagine the uproar if GOG's installers use internet connection to display current adverts during installations? Even if the internet connection is not needed and even if the game would install just fine without internet connection people would still complain (if history is any indication). "Why are GOG's installers calling home? I don't need this telemetry. I thought this was a DRM-free store. That's it; I'm switching to Steam."