Network Software Installer: System 6.0.x Support

What is(are) the proper version(s) of Network Software Installer that I should use to upgrade the networking software on all of my Macintosh computers?
All Macintosh computers running System 6.0.x should be upgraded with Network Software Installer (NSI)1.4.5.

Network Software Installer ZM-1.5, is not supported for System 6. This installer works on only System 7 or later Macintosh computers.

All Macintosh computers running System 7.x should be upgraded with NSI ZM-1.5, which can only be installed on Macintosh computers running System 7.
Published Date: Feb 19, 2012