DECNet Phase IV Fails to Install on OpenVMS 7.3

During installation of OpenVMS 7.3 on a simulated VAXserver 3900 under SIMH, I selected the installation of DECnet Phase IV as follows:

The attempted installation of DECnet Phase IV fails, and the following system messages are generated:

First, let’s mount our OpenVMS media and see if we can locate the appropriate kit manually:

OK, we’ve found our kit. Let’s install it:

Confirm that the .PCSI file is in the current directory:

And install the kit:

Excellent - DECNet Phase IV is now correctly installed. You can proceed with applying your DECNet license PAKs (the LICENSE command), and configuration of DECNet as appropriate (@SYS$MANAGER:NETCONFIG.COM).