How to manually update an addon from a GitHub branch?

Since I’m relatively new to Linux, GitHub and co. I’m wondering how would I go about updating, in this case the HomeKit binding, to a newer version from @beowulfe found at the link below?

I neither have an idea how to download it (except downloading the whole addons branch), where to put it or how to compile it, without breaking anything else from my OH2 setup and addons.

Any help would be greatly appreciated! :slight_smile: