Having searched the forum, I could not find a definitive answer, so I have posted this.
Did a windows update for Windows 8.1 before installing Windows 10.
I have been using my RadarBox with Windows 8.1 for over a year.
Went through the hour or so of installing Windows 10.
Faultless update from 8.1 to 10.
First thing I did whan Windows 10 had completed the install was to open my Radarbox.
Opened RadarBox for the first time under Windows 10 and it runs smoothly.
To recap, just upgraded from an updated version of Windows 8.1 to Windows 10 and no problems, in fact, my daily log includes flights today received from Windows 8.1 and also Windows 10.