i rechecked to make sure nothing is wrong with IE11 it's just slow to the point it takes pictures 5min to load and the news works as well at lest for me

Pale Moon is a nice, independent project for fork of mozilla, They try to have better privacy and less big brother stuff. I haven't tried the latest one. If yours doesn't work with latest version, use Firefox.

I use Firefox WITH NOSCRIPT extension, also some other privacy/firewall extensions that can be turned on or off with a menu button.
I have NO PROBLEMS using Firefox (current) with NoScript etc. on GOG pages.

Stop complaining and use Firefox WITH NOSCRIPT. And anything else in add-ons. Nocrpt is frequently updated, and gives grnular control over what domains and scripts are allowed. And Firefox has a good console.

Microsoft's IE is a total DOG - slow and always late to patch security holes.

The GOG website definitely doesn't work properly any more with older browsers. I've tried Chrome, Firefox and Opera. It's the same thing as Steam's dropping support for Windows XP and Vista. Good Old Games, eh?

The internet is a constantly changing thing. Why you would expect an old browser to keep working is beyond me.

Because it's not somebody's personal site to work according to how that person wants and what they cand manage to do, or one maintained by a skeleton crew of volunteers that's limited to what the volunteers may offer in terms of coding and maintenance, or even a fully free service where you may say that such conditions are the price of admission, but a commercial site, a store, which should aim to maximise ease of access and appeal to any and all potential customers. Plus, they did start out by catering to those interested in old games and who in general take issue with current standards and trends, and some of those people are still around (despite GOG alienating them with just about every move they made for the past 5 years...), and they definitely still have old games, so some may even have old computers with old OSs to play those old games, so it'd make sense to also visit the site and make any such purchases and download the installers on those computers they intend to play the games on too.

We're talking about the internet here, not whether GOG sells old games or not. GOG's target demographic is irrelevant, outdated browsers are outdated browsers.

When I first started using the internet in the late 90s, I was using AOL's dreadful browser. It worked back then (just about), but I wouldn't expect it to work now. Internet Explorer is a dead browser and Palemoon is wilfully non-compliant.

Yet there are some people using them. And GOG may prefer those people to take their game purchasing business here instead of on some other sites that work. Or so I'd think at least.

https://www.brave.com/

You get the benefit of using the Chromium engine for compatibility, but none of the Google... built-in ad and tracker blocking

I think they already ran the numbers on IE at least. I think they decided the market share was so small that those customers were not worth the extra cost of testing on IE. I imagine the same goes for Palemoon.
And it's not like people are being forced to use old and non-compliant browsers. At some point you've got to accept that the price for using those browsers is that not all sites will work.

Yes, and the price for gog to use angularJS hipster BS is that they loose sales to me and maybe others. Simple as that.

Yup. As I said, they probably ran the maths on that and realised the loss of your custom is less money than it would cost to make the new site run on your choice of browser. Sorry!