I suggest you try this posted by another user of Hotmart,they didn't say whether it worked or not. Can you or someone else using Hotmart try this
and come back to let us know if it helps.
1. Open the page you want to download the video;
2. Open the
Developer Tools on your browser (press F12 on Chrome or Firefox); I'm
using Firefox (on Chrome the titles may be a little different).
3. Open Network tab and press F5 to reaload the page;
4. In the Filter URLs field enter "m3u8" (whitout quotes);
5. You will get at least one m3u8 URL. Right Click over the first one and select Edit and Resend;
Click over the VDH extension icon and you will see that the video
options are duplicated. My guess is the first option is for the link
with source and the second option is for the link with authsource. So, just select a video resolution of the second option and it will probably work