Thanks for some info, that got me going.
I noted that the Sentinel program was updated as my son has installed the update of 7/7/24, but I couldn't read the files in` my SDS100 , and noted in device manager an error in the USB driver being "unknown", so I deleted the program and started fresh, now the driver was working, but I got an error code of 10 in device manager.
My son suggested trying a newer USB cord, and Viola, It;s all fine now