In response to requests, I’ve finally updated my plugin for the 4-axis XHC HB04 pendant. I switched to Qt5, which allowed me to fix a lot of the shortcomings of my original version.

You can download the new version here:Dropbox

This supports both the wireless and wired versions of the 4-axis pendant.
I’m offering it to the community free of charge because I can't bring myself to exploit a situation where the vendor refuses to support their own product. (Though if XHC wants to pay me...)
Before you ask me to modify the code to support your 6-axis pendant, understand that it's not a trivial undertaking. Since other plugins already exist for the 6-axis version, I will likely say no.

Thankyou to user lesspaul for assisting me in testing

I created a project page to make managing updates easier
You will find instructions for download and install there.
There is a pop up asking for a donation, this is entirely a free-will donation and can be skipped if you wish.
My feelings will not be hurt if you skip.

https://mkullman.itch.io/mach4-xhc-hb04-pendant-plugin

I would have edited my original post but I am unable.

I've been working with beta versions. I highly recommend. Makes working with Mach4 and my pendant a joy.