I have 2 of these units are they are still going strong so I wrote a new 64bit ASCOM driver for it that works well with N.I.N.A. - for controlling the dew heaters, power switches and focuser.
If anyone is still using one of these you can get hold of the driver here:
https://github.com/exploded/mhp-ascom-alpaca
This is only for the orginal version of the MHP - they changed the communication protocol in later versions.
Up until now there was only as 32bit ASCOM driver for the focuser and no ASCOM driver for the switches and dew heater controllers.