Quote Originally Posted by lat9 View Post
Just did a test install of OPC 2.0.5 on zc156a.

I'll note that the majority of the core-file overwrites required for zc155 are no longer required as the notifications are now "baked into" the base Zen Cart code. The two exceptions (on cursory inspection) are the changes required to /includes/modules/pages/login/header_php.php and to /includes/modules/order_total/ot_coupon.php; the remaining core files from the OPC distribution should not be copied for a zc156 install.

I've corrected (for v2.0.6) the issues identified by @linuxguy2 in post #1055 on OPC's GitHub repository and will be reworking the distribution layout and/or installation instructions for Zen Cart 1.5.6.
I'll get the changes from github and test.
Thank You very much for your time and expertise!
You Guy's ROCK!