Reading this, I saved my older Dragon Age Origins offline installer, while I also downloaded the new one.

I installed and tested the new installer on my 6 years old non-gaming laptop:
Dell Precision 3530
Processor: Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz (12 CPUs), ~2.6GHz (6 cores)= 12 logical CPUs)
Memory: 32768MB RAM
Windows 10 Pro

Running the game at 1920x1080 resolution, Very High details, 2x AA, High Textures, vsync off (not sure if NVidia vsync is still enabled), I seem to be getting around 40-55 fps at least on the start of the game, running around etc. The game felt pretty smooth to me overall, not something I'd call jerky at least on such old non-gaming laptop.

I checked the Task Manager, and sure enough, the first two logical processors are running at 100% while the rest 10 are low.

I guess I will next uninstall this, reinstall the older version, and see if I get any better FPS with it... For me personally the new version seems fully playable but of course if there is no good reason to limit it to two logical CPUs, then I'd rather not have that.
So should this force the game to several logical CPUs instead of just two? How exactly does one use that?
E.g. I have 12 logical CPUs so if I want to use them all with the new version of this game, do I change the DA:O desktop shortcut to include the following, and/or run that in the command prompt:

%ComSpec% /c start /affinity 1FFF "C:\GOG Games\Dragon Age Origins\DAOriginsLauncher.exe"

EDIT: In command prompt I ran this in the DA:O installation folder:

C:\GOG Games\Dragon Age Origins>%ComSpec% /c start /affinity 1FFF DAOriginsLauncher.exe

At least that didn't seem to change the behavior, only the first two logical CPUs are still maxxed out. Not quite sure if it should be used with some other executable but that launcher is the one that the GOG shortcut points to, and I didn't see any other suitable executables in the game installation root directory.

EDIT2: Maybe I read the instructions too hastily, I'll try some different format...

This starts the game directly (without the launcher menu), but still only the two first logical CPUs are maxxed out:

C:\GOG Games\Dragon Age Origins\bin_ship> DAOrigins.exe /affinity 1FFF

Gotta say... that's disappointing.

I was about to download the offline installers for DAO to back it up last week, but couldn't because of focus on other things.
When Im to download the offline installers to back them up, this happens.

Does anybody know how to select an older version using Lgogdownloader on Linux with the --galaxy-install option?

Edit¹:
Managed to find this command: Which show this as result: Which version should I download if I want preserve the old DAO version before the new update that broke it?
Is it 4?

Edit²:
Here's the command I used and its downloading Dragon Age Origins, build 4, version 1.05 2016-07-05 (if I understood correctly):

They're listed newer to older, so either 1 or 2. According to the changelog, The 19th July 2016 (2) added missing DLC. The 22nd March 2017 (1) merely added Cloud Saves. Either one should be the last good one before the recent update.

Oh ok, thanks! I will restart the download then with:

Last time I installed DAO (2 years ago) on a 1080p display the font mod was an absolute must
(don't remember the name). Journal entries are way too small at that reolution, 1440p and 4k must be
a nightmare.

Easily fixed:-
https://www.nexusmods.com/dragonage/mods/6332
https://www.nexusmods.com/dragonage/mods/73

It yet again highlights though why its futile for GOG to try and pre-include "one size fits all" scaling mods as there are 3 different versions of the scaling mod (one for 1440p, one for 4k and one for Ultrawide).

Is there a similar solution for Windows users?

I believe GOGcli works almost the same as lgogdownloader:

https://github.com/Magnitus-/gogcli

But I've never used it directly.
Since I also use Heroic, and Heroic uses gogcli as a backend, I use it indirectly, but never tried to download older versions through it, so I can't really help in this case.

Give a try though!

Much thanks. Ridiculous that gog screwed up yet again.

For those installing an older version via Galaxy via "rollback" with the hope of simply zipping up the game folder and calling that a "backup installer" - this is one of those games that can write multiple registry entries under...

HKLM\SOFTWARE\Wow6432Node\BioWare\Dragon Age
HKLM\SOFTWARE\Wow6432Node\Electronic Arts\Electronic Arts\Dragon Age

...that may actually be used by the game and isn't just passive Galaxy metadata. So you might want to back any keys up you find there.

I don't have a clue how to do either workaround for getting an older version download, so I guess gog just ripped me off and stuck me with a broken version of the game. Bullshit.

Not sure if it is broken in a sense that at least for me the new version seems to be fully playable (on an older non-gaming laptop with pretty weak 6-core CPUs)...

...but it is certainly not optimal that it is forced to use only two logical CPUs, in case there is no real issue running it on more than two. So I guess you need to test it if that restriction causes issues for you.

I am still trying to figure out if there is some way to force it back to use more. How exactly has GOG forced it to use only two logical CPUs? I presume they haven't compiled the whole game again from the source code or anything, but changed some setting somewhere?

Given that backlash this update has caused, there's a high probability GOG may reverse the change.

I hope so. Insane they thought changing game exes for all was a good idea.

Maybe this will wake GOG to why they should always keep 1 or 2 older versions of offline installers for us to download. There is a reason I keep older version backups because of stuff like this going on with patches.

I have seen too many dev patches break games. Just like what AB2012 said, a PC is not a console where we all use the same hardware. :(