To verify that “K7 Button Installer” is effectively installed:

1. Launch Kontakt standalone.
2. Click on “Manage Libraries”
3. Click on “Launch Native Access”

Clicking on this button doesn’t launch the (useless) “Native Access” anymore but the Bobdule’s Library scanner, just point it to the exact folder where you have installed all your samples libraries, let it work fully, quit and relaunch Kontakt, and voilà!

Your newly installed libs should now appear in the list.

if “Kontakt 7 button installer” actually doesn’t work for you: try to launch it as admin (right-click on it, choose “Run this executable as Administrator”)

…
(Note: perhaps you already know all that, but this message is in priority destined to total newbies (like me, always).