how to install OpenVPN for the ASL3 version?

Does anyone have current instructions on how to install OpenVPN for the ASL3 version of AllStarLink on a Raspberry Pi 3B?
I need for the node to be connected to the network without using port forwarding.

Just install the openvpn package like normal for Debian and configure as desired. The package itself would be sudo apt install -y openvpn and the configuration is in /etc/openvpn/client. Create your desired configuration and then systemctl start openvpn-client@NAME where “NAME” is whatever you called your .conf file in /etc/openvpn/client. If that works, make it permanent with systemctl enable openvpn-client@NAME.