Please follow the steps mentioned in the section "CMSIS-DAPv2 interface driver for DAPLink mode isn’t installed properly on Windows 10" in the Troubleshooting chapter of the KitProg3 User Guide.
That should get DAPLink mode up and working again
I followed those steps, and they did not work.
It says to remove “mbed Serial Port (COMXX),” but this does not appear in my device list, no matter the mode the board is in.
I remove the mbed Composite Device (which was the only entry under the header), and scan for new devices, and it installs as DAPLink CMSIS-DAP\USB Composite Device, but it does not work. Windows still says it does not recognize the device.
I've tried installing the drivers from mbedWinSerial_16466.exe and from Mbed_installer_v0.4.10.exe, but they both perform in the same way.
I just figured it out. I was using a usb extension cable, since the provided cable was about 3 inches long, and for some reason that was causing an issue. I had to delete the drivers and play around with it a few more times before it figured it out, but now it shows up.