You might try this article in their support library:
https://docs.remote.it/platforms/ma...n-packages#raspberry-pi-with-raspbian-stretch
I suspect it will kill connectivity to both clients, so you may have to reinstall both.
Yes that was the site where I got the "sudo apt remove connectd" command for stretch.
I tried to recreate the connecting to the wrong RPi3 again but this time Remot3 went to the proper one. So I don't know why I saw the wrong Fermentrack come up the first time. Perhaps it was a cache on my phone or something but it is all OK now.
Thanks for responding though.