I'm trying to install the USB drivers for KFlop on a Win 7 64bit laptop. The KFlop is recognized but no driver is associated with it. I click "Update driver", browse to the just-downloaded 4.34 signed drivers, install the drivers. I then get a message that the signature could not be verified. I've uninstalled the driver and reinstalled about 5 times already and rebooted twice.
The same driver file works on my Win10 laptop (though that took several tries to get past the signature verification, too.)

Any suggestions about what to try next?