I am well aware the WD100 has been out of support for some time and therefore only works with the firmware of the period.
Nonetheless, I would be very interested to add one to my system even if it means downgrading the firmware and/or app.
According to the community post below it was still possible in 2018:
Has anyone had any success in downgrading the firmware to allow WD100 compatibility and does anyone have links to the required firmware?