macOS Mojave users
An additional step is required to resolve a known issue with the VPN-Plus client running on Mojave (10.14) not saving users passwords when the option is selected. You will require root privileges to perform this operation.
From a terminal, change directories to:
Change permissions on the users_dat directory to allow user preferences to be saved:
chmod 777 /opt/sslvpn-plus/naclient/users_dat