Matt here, the extension developer. I didn't receive any emails from you. There must have been a technical problem with the email being sent/received.
I monitor the support email inbox throughout my day, and I also have a support person in another time zone, so during weekdays we always respond to support emails the same day.
Please try contacting our support email again, maybe using a different email address to send, or if you click on the review button on this page, you will get my personal email address which you can use to contact me, and I will resolve your issue with the lightbox not showing.