Hey Wizard,G'day Will and welcome to linux.org
Just a holding post for you at the moment as this is not my area of expertise, but the folder generated from your download - does it contain a file named install.txt or readme.txt ?
These can shed a little light on the procedure.
I expect Alex or other will be along sooner or later - depends on how they are spending their Easter
I went to that Github page to download the driver so I could take a look at all of the files. For some reason the green download button is missing. Tried 3 times.
Bizarre or what?