Dear CarlWhat?,

As advised, I have removed the old Square module php files by following the hierarchy of your Square WebPay module.
I'm no longer seeing the "old" Square module in my Admin/Payments.
There is no more getting booted out on Chrome, Edge, or Firefox!

Removing the old Square module (php files) is the step that messed me up the most, because I thought the "Remove Module" in Admin/Payments would do the trick.

Thank you so much for your hands-on help, patience, guidance and explanations. I've learned so much from you with this.

I'm in awe of the many contributors of Zen-Cart and appreciate what excellent help I am able to get from the forum community.

nbl to carlWhat? et al