SOLUTION: Echo Collective offers .nki updates for those who bought libraries before 2013 (under the FAQ dropdown, not sure if I should link from here...). Just download those and replace the instruments folder.
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Alrighty, before you put me off as an idiot, let me state my case:
On the sister site, Echo Collective's Swell was released recently and I can't open any of the instruments. Whenever I try, I get following error message: " This patch has been generated by a newer version of Kontakt. Please upgrade your copy to load the patch." This is strange, as the library is from 2013 and the EULA states that only Kontakt 5.3 + MacOS 10.7 and up are needed to run Echo Collective libraries.

So, common sense tells me to check for updates, but both standalone and VST/AU are up to date (5.8.1). I tried stupid stuff like permission reset and re-downloading, but to no avail. At the moment my only idea is that the instruments were re-saved by someone using Kontakt 6.
Does anybody have an idea on how to solve this?

I'm running legit Kontakt 5.8.1 on a MBP with MacOS 10.12.6
Thanks in advance to all who take the time to answer!

 

Last edited: Jan 10, 2019

yes they have either done a batch resave or saved the nki etc is a later version sounds correct.....