Comment on the sql update included in the package.
The first line to create the table says:

CREATE TABLE `zen_products_with_attributes_stock` (

If your sql database automatically ammends with zen_ then you will wind up with a table called:
zen_zen_products_with_attributes_stock

I assume the module is looking for a table called:
zen_products_with_attributes_stock

so i have deleted the 1st table created and recreated a new one with only one zen_

Haven't gotten any further with the install yet though to confirm.