Logic Pro Not Linking to External Plugins

Please do not confuse plugins with libraries and downloading with installing.

In order to see the plugins in Logic, you have to install the plugins on your computer, just downloading is not enough. For native instrument plugins, you can do this in Native Access. For Native Instruments plugins, you can do this in Native Access. After successful installation, you should see the Native Instruments plugins in the Plugin Manager, even if no library is installed. If not, restart your computer.

The library is separate from the plugins. Native Instruments libraries can also be installed with Native Access. If you have already installed the libraries on an external hard disk, you must link the libraries by pressing the Repair button in Native Access.

I seem to remember that you need to open the stand alone app of Kontakt, Komplete Kontrol, etc before using them as plugins in Logic. I believe the apps install the plugins in the right Location for Logic to find.

This!

I always open the stand-alone app first to organize quick-load or to verify, Kontakt is is able to find the libraries at all.

Since your problem is not related to Logic, better ask for help in a Native Instruments forum or watch some videos or read help files about installing and linking Kontakt libraries.