In windows both in Firefox and Chrome there seems to be a redirect loop. Don't know if I'm the only one here.
https://www.native-instruments.com/en/reaktor-community/reaktor-user-library/all/all/all/all/all/latest/1/all/
Yes, probably you are the only one, since you are using a very wrong link!
This is the correct link: https://www.native-instruments.com/en/reaktor-community/reaktor-user-library/
All the rest /all/all/all etc. at the end are nonsense and not a part of the original link.
However, even with your wrong link, there is no redirection, when i clicked it, it opened the library's main page. Also Firefox and Windows here.
So, unless this is not some kind of joke, the real bug/problem is in your Firefox.
Note: In your profile you state that your operation system is Linux and not Windows! Yet here you report a supposed Windows "bug".
So, you are lying, either in your profile, either on this post? or, what is the case?
Windows and Chrome here, I can only reach this link of yours when I click on any of the category filters and disable said filter afterwards. But... what now? I can navigate and browse around the site just fine.
Do you just think that you're in a redirect loop because the URL looks like that? Or, are you actually stuck?
Once it gets to that odd link it loops, but for some reason Firefox gets it there. Windows and Linux