Hello @thegpx,
You need to run the install.sh script with this flag: ./install.sh --chirpstack=[install/not_install] .
Also, If you want specifically only the packet forwarder you can install it directly from here: GitHub - Lora-net/packet_forwarder: A LoRa packet forwarder is a program running on the host of a LoRa gateway that forwards RF packets receive by the concentrator to a server through a IP/UDP link, and emits RF packets that are sent by the server.
Best Regards,
Nikola Semov