It's about as idiot-proof as you can get IMO. In my decades of IT roles, I have come across a shocking amount of people that cannot operate a ZIP file to save their life.

Remember, these are people that cannot even find the files they have already downloaded, and then you check their downloads folder and there's 12 copies of it in there.

Note for browser UX people: The default flow for most browsers saving files doesn't actually tell you what is happening, it just... disappears into the ether as far as non-tech users are concerned. Can we fix this somehow?