I had to jump over to Chrome in order to edit my post so that I could type this text. For some reason Microsoft Edge didn't recognize or load the entry field.
Anyhow, I just heard about your product, JRT, and decided to try it out. Unfortunately as soon as I attempted to open it I got the error that you see below.
I had also downloaded and was fully able to use AdwCleaner beforehand and really liked it.
I am currently running Windows 10 Version 1607 (OS Build 14393.953) in case that helps you to pin anything down.
Thank you so much for your time and assistance.