I've just started trying to install this mod myself on a site that only has digital delivery. :blink
I found this in the READ ME instructions that came with the mod. I don't know if it will help you or not, but maybe it's worth looking at:
MERCHANT CALCULATED SHIPPING
============================
In order to use this module you must have some Real Time Shipping provider,
such as USPS or FedEx. This Module must be activated and configured in
Modules->Shipping. For each enabled module you'll have to set the default
values in the Google Checkout Admin UI.
This Value will be used if for any reason Google Checkout cannot reach your
API callback to calculate the shipping price.
The available shipping methods for each shipping provider must be configured
in includes/modules/payment/googlecheckout.php in the mc_shipping_methods
parameter. If you want to disable one or more methods, just comment them out.
Be aware that if you mix flat rate and real time rates, both will be taken
as merchant-calculated-shipping.
Script to create new shipping methods
http://your-site/googlecheckout/shipping_generatorMore Info:
http://your-site/googlech...shipping_generator/README