Restrict payment options for mixed (virtual-normal) orders

Hi all,

my question could be related to the topic http://wordpress.org/support/topic/restrict-payment-options-based-on-product but the solution provided does not solve my problem.

My products are printed books, with some virtual/download variations (Pdf, ePub, ecc.)

I want to disable “COD” (Payment Gateway) for mixed orders (virtual/downloadable and normal products shipped at the same time).

Can you help?

https://wordpress.org/plugins/woocommerce/