Hi mate, I've uploaded the unsupported appstore.bundle, you extract the folder from the zip and place it in the directory with your other .bundle packages (plugins basically) now on windows this will obviously be a different location to Freenas, but from what I can gather, it should go here:
mv /mnt/YourFreeNASNameHere/UnSupportedAppstore.bundle /mnt/YourFreeNASNameHere/jails/plex_1/usr/pbi/plexmediaserver-amd64/plexdata/'Plex Media Server'/Plug-ins/
your location will read a little differently to that but that should be enough to get you there, I know nothing about freenas though, having never used it