See https://sourceforge.net/p/gnv/wiki/InstallingGNVPackages/ for the most up to date generic installation information.
If the HP GNV kit is installed, make sure that the [vms$common.gnv.bin] directory exists. If it does not, it means that you have not run the mandatory GNV startup file and the installation will not work properly.
The files are in ZIP archives. Use the commonly available UNZIP utility to unzip them.
Copies of unzip are at ftp://ftp.encompasserve.org/
Please read the release notes for more detailed information about the post installation procedure.
If you install to a different disk than the system disk, the release notes will be in the [vms$common.syshlp] on that disk. The gnv$coreutils_startup.com file will also be in the [vms$common.sys$startup] directory of that disk.