https://www.zen-cart.com/downloads.php?do=file&id=232

I've delayed putting this back up forever, but I can confirm this works with 1.3.6. This will be in the download section soon.

What this mod does:

This module allows shipping insurance to be charged in three ways. You can either choose standard USPS rates, a percentage of the subtotal, or by an incremental rate of your choosing. It calculates US, Canadian, and then international rates. It limits canadian to $8.60 or orders up to $675 (USPS Canadian shipping indemnity limit). This module WILL NOT add insurance to virtual items or gift certificates.

Please post any issues or questions here!