I'll update this again with an excerpt from the support ticket with LCWeb:

"I am extremely unhappy with the experience of getting this plugin working. I feel as if I've been funneled away from a known system of trust (Entavo) to your personal business site which for me is unknown where it took multiple steps and multiple codes between your site and email to create an account and activate."

For anyone else, you MUST create and activate an account in their system. Then you MUST register and activate the plugin using your site URL. Mine is a local network wordpress and is publicly unavailable. Despite that I HAD to activate the plugin using the "production" code. I don't know why staging or offline did not work. I expected "offline" to be the correct choice.

I've found this to be a confusing and frustrating process. You may not and be perfectly fine with the additional steps. But just so you know, you CANNOT activate this plugin from the code in Entavo. That code in Entavo's download area is worthless. The LCWeb system MUST be involved in getting it activated so you can use what you purchased.

Additionally, I HAD to activate the plugin to open a support ticket with LCWeb. I can't find a contact form on their website nor does it have an About page where businesses typically list a support email address.