Related to the old questions about legit Kontakt and k'd running simulaneously but not the same question.
Also threads about this are really old, no doubt things have changed.

I own Komplete 14, and use it on my laptop, but not sure what will happen if I try install Native Access on the big box alongside k'd Kontakt 6 + libs.
Can they co-exist?
Can I somehow lock or change permissions on k'd Kontakt folders so Native Access can't write and break things?

 

Don't know what hardware you're running, but it should be completely fine.
I would download the libraries you want from legit Native Access and delete it afterwards. They've upgraded native access where to force upgrade your Kontakt.
Your cracked libs will just show as DEMO (that's totally normal). Other than that, it's harmless.

My advice is to upgrade your k'd Kontakt to 7. It's been available for some time now on sister site.