That file only loaded a logo for me. But rather than looking for the simplest DTH, why don’t you use the Z wave Tweaker?. It’s intended for diagnostic purposes. It should work with any certified Z wave Mains powered device.
https://github.com/codersaur/SmartThings/tree/master/devices/zwave-tweaker
This is a device handler to assist with interrogating and tweaking Z-Wave devices. It’s designed for end-users who want to tweak their devices and for developers who want to quickly discover and report the functionality of new devices. It is intended to temporarily replace a device’s normal device handler.