Multiple Ship-To Addresses, v1.0.0, does not work with Zen Cart v1.5.3. I'm looking into the long-term solution and will post back here once it's finished.
I've submitted v1.1.0 to the Plugins for approval; it's v1.5.3 enabled (and still supports v1.5.1 and v1.5.2).
Important Note: Since this plugin provides an update to the Check/Money Order payment method that specifically enables the multiple ship-to addresses, it's important to ensure that the payment method is removed prior to the plugin's installation and then re-enabled to provide the multiple shipping address support!
I've just submitted v1.1.1 to the plugins for review. Updated to correct:
1) Unwanted redirect back to checkout_shipping after selecting new address
2) Improper handling of TEXT and checkbox attributes
3) More properly handle changes to the shopping cart after multi-ship addresses have been selected.
4) Whitescreen when UPS shipping is selected.
Thanks for your efforts! This has been discussed for a LONG time!
Is there a demo site anywhere? I'd like to see how this looks to a user.