You can download old releases of pfSense, all the way back to 1.0.1, from here:

https://atxfiles.pfsense.org/mirror/downloads/old/

http://files.nl.pfsense.org/mirror/downloads/

Contains newest and old releases.

Restarting OpenVPN on the CLI of a pfSense can be done using the following command:

echo "<?php include('openvpn.inc'); openvpn_resync_all();?>" | php -q

This issues a restart command as if you would via the web-interface.