We only offer refunds if our plugins are at fault or do not do what they say. Do not worry about the plugins not working and you not being able to get a refund.
If it is a compatibility issue with other plugins (other than WooCommerce for Divi BodyCommerce) we cannot be held responsible for this. We have however worked with our customers to make our plugins compatible with various plugins on request so please let us know.
We want to make sure you are happy so any issues please get in touch and we will be happy to help!