Not sure what is going on with this plugin

I thought it was the answer to my problems now none of my shipping options work. Not to mention i found that this might not be the right plugin for my vendor’s needs. It is a stripped-down version of a 100 US dollar plugin that is you need to buy from WooCommerce
Digging through forums i did find this about another plugin that might allow my vendors to change their shipping options.
The per-product plugin might be the way forward in allowing vendors to change shipping rates on items. Although it is not clear as to what else you need to make the plugin work. If you have to have the Front-end manager or not.

I have now deactivated the plugin to find that even the basic shipping cart now no longer functions as normal. Flat rate shows up on checkout with no price, just the word flat rate!!.

In dire need of help with this plugin