I just went ahead an purchased a "Starter" license, and that allowed me to access all of my free 6.x endpoints and update them to 7.x without having to use a temporary license key. I've been using Remote Utilities for free for such a long time that even though I still don't have more than 10 endpoints I need to access, I figured it was time to give these folks some money. It's working great.
Yes, users with commercial licenses still can connect to their remote Hosts of version 6 since come of our paid users want to continue using their version 6 license. Thank you for your feedback, we appreciate it!
Please feel free to post another message if you have more questions.