Thanks for your additional input!
Re."appearing as if they have to be authorized and/or reinstalled by clicking on them."
---Actually won't ALL libraries initially appear as needing to be "installed" not reinstalled, since there will have been no previous installs on the new drive??
Re. "install Kontakt first, and then use the Native Access relocate option to find where you have the sample content already installed."
Sorry, but this isn't understood. How can one "relocate" a library's samples if the library itself has not yet been installed?? My guess is all I'll see is the list of 100 libraries to be installed. Even now I don't see any relocate option for the libraries that show up in NA as uninstalled. This is where the suggestions to just relocate the samples don't seem to make sense. WHERE is that relocate option you suggest?
1. When in Native Access, open the NOT INSTALLED window/tab.
2. Hover your mouse to the left of the INSTALL icon at the far right of any product that appears in the list, and a little magnifying glass with the word “LOCATE” will appear.
3. That “LOCATE” is the option to manually locate anything already installed, so as to avoid having to reinstall from scratch. Then that item will appear in Native Access’s INSTALLED window after that. This is precisely the way to find sample libraries you have already installed on external drives.
4. As you mentioned, the essential software packages, or anything not yet located, will show up in your list of products as not installed, with options to decide wither to locate it, or install anew.
To be clear in terms of what you call "libraries," there is a distinction here between the essential software packages from NI which will need to be installed, and locating sample libraries on other drives that have already been installed at some point prior to moving to the new Mac.
Things like Absynth, Kontakt, Reaktor, and FX are all system-level applications that must be installed anew. Those get installed into the main NI folder, in my case, 36 items total.
BUT, sample content for Kontakt-based instruments (NI and third-party), or Battery content, if already installed on external drives, can take advantage of the "LOCATE" function to get them to appear as "INSTALLED" in Native Access when setting things up.
And obviously, the bulk of these will need to see that Kontakt is present, hence my suggestion to make sure that is installed on the system drive first.