I had this issues as well. Even with the new launcher.
Windows 10 21H1.
Various types of local USB cablels, even ordered one from UltraSabers.
Still no luck.
The ONLY way I was able to get this to connect to any version of the Software.
Plug everything in.
Have the Software / Launcher Running.
Pull out one of the batteries. Wait. Plug back in.
This far from ideal, but this was the only way I could get the software to see the saber.
This should be the link to version 2.88 of the launcher.
http://www.saberforum.com/index.php?topic=23237.0Good Luck.