I tried Firefox and Waterfox, both came up with the "connection timeoutt" message. I do nout use Wastefox regulary, might as well been I logged in the first time using Waterfox.

Odd, I have just started a random download on the iPad and it went straight through. Are other websites working? Could be you are having an issue?

Yeah, something similar here.
Tried to download the offline installers of:
-Grim Fandango Remastered
-Janosik

And both took like 90seconds to start downloading... the download speed for Grim Fandango is very slow.
Last night I downloaded Janosik (90mb) and other small games without problems so the fault its not my webbrowser or anything on my side.

How do I raise a ticket? After spending some time reading posts on the forum I am interested to test first hand the timely response of the support team...

Support - Downloads from the menu at the top of this page.

Thank you Ice_Mage. I just raised the ticket to my downloading problem and also mentioned this thread.
I'll repost here any news when received

I just tested the download of the same installers as yesterday. It is working again. The downloads are starting fast with decent download speed.

Everything is fine again.

I think the most likely explanation is that there was a problem with a specific server in Gog's CDN. It would explain why the issue couldn't be reproduced by other customers.
According to Arundir's reply above the issue appears to have been fixed a few hours ago.

I couldn't download anything yesterday. Galaxy either hung at showing the install dialogue, or after clicking install. Offline installers, no deal either. I suspect a problem with the internet/CDN, have all people with problems been from Germany/Europe?

Agreed 100%. Steam Workshop is the single worst thing to happen to the modding community. In my mind, it's worse than Bethesda charging for horse armour.

I encountered this issue several times before.
GOG usually fix it within 24 hours after I open a ticket for it.

Wasn't Beth behind the idea of paid mods (through Steam workshop too), where they would get the bulk of the money (because, their game) and the modder just some change?

Don’t know, wasn’t HL source also part of the decision?
Anyways, beths have now gone full on we own it all with creation club.

I've opened a ticket before posting on the forums and waited several hours. There still is no answer on the ticket #1085139 to this day.
So for the future - perhaps assume that people come to the forum because nobody responds to their ticket.

I opened up another ticket today and someone finally responded. They completely ignored my request for a refund and told me to go bug hunting for them, gather logs, replicate errors before they do anything else.

@SmollestLight: I don't want apologies or sad smileys. I want my money back. What else should I do? Beg on my knees, spent the weekend searching for your server issue bugs? What else? If you truly feel sorry, get the support staff to process my refund. I've been a customer since 2014. Complying with their own 30-Day Money Back Guarantee so that I can be done with this shameful display of technical and customer support would be the right thing to do if you truly feel sorry. After that, I will never buy a game on GOG again.

On the other hand, it took you over 5 (FIVE!!!!!!!!!!!!!!) hours to reply to the above message. Why didn't you respond right away, but decided to wait that long? What is wrong with you? Do you enjoy keeping people waiting?