When you upload a Wistia video you have the option to allow people to download it.
You do this by going into “edit” for the video, clicking “Video Actions”. Make sure “Share” is on and turn off everything within share except “Download”. You will see a “Configure” section by download. Make sure “Original” is selected.
Depending on how you want your video displayed and how you want your users to interact with it, you might decide you an an external button to trigger the download.
It forces a click on the HTML element that has an attribute
data-channel with the content
This code assumes there is only one Wistia video on the page, but using other attributes to limit what happens here should be easy enough.
Here is the most simple form of the HTML you would need, of course you probably will have an event listener for this;
And that is it! I hope this helps someone.