do this by Pressing the WINDOW key then + R.
This page has an excellent explanation of HLS Streaming and how it works. Noted at the MS Store, when you are about to download the JW Library app, select 'See system requirements' scroll down and you will note that it requires Windows 10 Build 14393.0 or higher. JW Platform Developer Guide JW Platform Demos and API Sample Code JW Player was a world-class partner enabling us to meet our commitment to deliver the first truly digital Games across Europe, with flawless delivery across every screen, device, and property. It is bad in that it makes accessing the video and keeping it much more difficult. HLS Streaming is good in that it has given the studios confidence in streaming technology and allows us to enjoy Netflix and others like it. It is used by Netflix to help protect content through encryption and works well when done right. This was apparently invented by Apple to help streamline delivery over networks and breaks the video into chunks, encrypts it and sends it to the player. If none of these methods work, the video may use encrypted HLS Streaming (HTTP Live Streaming). If none appears, select the extension icon from your browser bar and select to download the video.
Install either or both and use them on the page where the video is hosted. It really is a matter of trial and error I’m afraid. Just like the URL method, IDM will work on some JW Player streams and not others.