I will try to explain what I need to do:
I have two custom-post-types:
1. Categories
2. Products
I used your plugin to create a multicheck for my products to be able to assign my CPT products to one (or more) of my CPT categories.
Now, what I need to show, in the front-end is a WP_Query for each CPT category, so, example:
CPT Categories:
a) Category A
b) Category B
c) Category C
In each page, I need to show my CPT products assigned to the category.