Hey,
RadiantHeat, don't yell at us, we are in the same boat as you. We are not the manufacturer / retailer of the VFDs, this is just a forum where people can volunteer to help each other, and share their experiences.
Particularly please don't complain about the modbus plugin, this was written by an end user and generously shared with us for no personal gain.
Personally I appreciate your frustration, but a situation like this is always a possibility when you buy virtually unknown products from an unknown manufacturer, for a substantially lower price than competing well known products.
In future you would be better to do some research before you buy. Google is your friend!
Cheers
Dave