I just got the same error “Insuffient data was provided. Please ensure the required product import fields are available and have been matched” whilst running a test csv file which does have those fields all included, and they did match up.
I am running WP e-commerce Version 18.104.22.168 and your fine Product Importer Deluxe version 2.8.8.
As we host the site ourselves, I can make any required hosting changes, if needed.
Thank you, Klaus