When 4.07 was installed on my primary, I could not connect to a secondary running 4.05. Anydesk to the rescue! I installed 4.07 on the secondary but still could not connect fully: the window came up but neither the mouse nor keyboard was sent from primary to secondary. So I removed the secondary from the primary's list and went through setup to reconnect. The setup is broken, but I finally got through. Again disconnected the secondary and went through the setup to get screenshots for this post.
First the network scan. Unlike 4.05, 4.07 did not find computer name, only the IP address:

Notice the two colons in front of the IP addresses. I chose the top address (both are the same machine, NearlyHedlesNik) giving this:

Those colons went into the computer name: it did not ocur to me the first time that that would also be used as the IP for connection. Notice the "Always use the IP address ..." option shows the colons as part of the IP address. Did not catch that the first time when I checked the option.

After entering the passcode and clicking "Test" the following came up:

Repeating the setup and removing the colons from the computer name (second screenshot above) fixed the problem.