Transmission + OpenVPN unzip issue

Hi all

I am having an issue with getting a version of transmission and openvpn working on my Pi setup

Transmission on it's own is fine however the image

https://hub.docker.com/r/haugene/transmission-openvpn

Seems to constantly restart and in the logs gives the following error

Using OpenVPN provider: NORDVPN
2019-03-29 10:01:34 Checking curl installation
2019-03-29 10:01:34 Checking unzip installation
2019-03-29 10:01:34 [41mERROR:[0m This script requires unzip but it's not installed. Please install it and run again.

Total noob and unsure how to check if unzip is installed where needed. I can unzip files fine via ssh. I have my containers stored on an external drive so wondering if that's an issue

The Pi is okay for what I'm using it for just niggly to set up. I'm quite stumped here.

I have installed openvpn as a plugin, but I'm unsure how to get it to auto connect to my NordVPN on reboot etc without me having to ssh and select the specific server. From my understanding Nord should select best to me like it does via the app

In case anyone runs into a similar issue mine was resolve by mounting the container for Transmission onto the SD card rather than having it mounted to the external drive.