1) open your browser's "Add-ons and themes" page (using the URL: "about:addons" - or by navigating via the menu)
2) click on the demo version of "HLS Video Download" (that you installed previously)
3) click on the "Options" tab: there is a purple button that will guide you through the purchase and automatically upgrade the demo version to the full version

If you provide a link to the site that you are trying to use the plugin on, I'll have a closer look at what is going on.. The site might use some HLS feature that the plugin doesn't support yet or it might not be using HLS at all. Streamed videos are not all the same and different tools my be needed to deal with different protocols. But that's exactly the point of the free trial version - to let you test if it works on the specific site that you are interested in. Good luck finding a tool that is tailored to whatever that site is using.

obviously files without data cannot be played by VLC. it would be interesting to know your test case in order to investigate what exactly is going on here.

I just did a quick test with one of the movies on that page. The respective movie supposedly was available from 3 different servers (see "VidSrc"), i.e. "PRO", "Fenbed" and "Mixdrop". From what I observerved, "PRO" did not play at all (nor download with my plugin) but both "Fenbed" and "Mixdrop" did play and could be downloaded just fine.
I find it sad when people downvote the plugin based on false claims.

I just tried the above mentioned site and the file that I tried just downloaded fine (using Vidstream as well as MyCloud - VideoVard and Streamtape do not play on my machine due to my popup blocker settings, so I do not know if those would or would not download). Can you be more specific what exactly did not work when you tried it?

This plugin takes the approach of implementing the most *commonly used* HLS features - but to not provide every exotic HLS special case in advance. (I think that most users are better served with an inexpensive plugin that covers the most relevant HLS features than with the alternative of having a 100% HLS feature complete plugin that would be much more expensive.)

Therefore I can only repeat myself: Before buying the plugin you should use the free demo version to verify if the plugin correctly downloads a *playable* version of the specific stream that you are interested in.

The stream that this user was trying to download uses AES-128 media encryption. This is a rarely used HLS feature that I currently consider to be rather irrelevant (this is the first incidence of a user actually requesting it) and which therefore is indeed NOT currently implemented in this plugin. (If there was some substantial user feedback requesting a respective enhancement, this feature might be added in a future plugin version. By all means: If you find that the demo version does not work for some stream that you are specifically interested in, drop me a line to add some weight to a respective feature request!)

Regarding download speed: This plugin sequentially downloads all the chunks of a respective media stream. This approach was selected for its robustness, as servers might actually detect and block unusual parallel download activity. I imagine that other downloaders using a parallel approach might be faster in certain scenarios, e.g. if the server allows parallel chunk downloads and if it imposes bandwidth limitations for individual files - provided that the user's internet connection is not the limiting factor anyway.


Update 26-12-2021: The new 1.1.0 release of the plugin now supports decryption of AES-128 encrypted HLS streams.