woocommerce product builder – pre-sale questions

Hello,
I have som pre-sale question: is the Woocommerce Product Builder compatible with the last WordPress version?
Is it compatible with Merchandiser Theme?
If I should have some issues of compatibility, how does it work? Is there a refund?

And, at the end, I need to know if I can add product of the same category on two different steps (I need that user is obliged to purchase 2 products belonging to the same category).

Thank you