I think it's actually an easy fix -- using vyprvpn-linux-cli-1.7..deb, there's a problem with the installed systemd service file /etc/systemd/system/vyprvpn.service
Specifically, as root, edit line 9 to have an absolute path, i.e.:
Save the file, reload using
# systemctl daemon-reload
and then follow the directions normally.
I tried to tell support about this nicely but "mia" simply hung up the chat on me. Sigh.