I had a few issues and wish to offer this:
I used a XP machine
make sure when installing the driver via Zadig that you close the windows play and play install driver install – it was open in the background so the Zadig install kept failing until I closed it.
after find device – I missed the fact that you have to unplug and reset up OpenSprinkler in firmware mode – so the firmware update failed as the OpenSprinlker had returned to normal run mode
after the update the static ip address is lost!!!! – I guess the only way to reset it is back to pushing buttons 😉
hope this helps