Thank you for making it a short example. I visited your page & I found this:
I downloaded the only variant VDH offered. It took hardly any time & it played fine in VLC. I'm on Windows 7 64-bit, Firefox 105.0 64-bit, licensed VDH 7.6.3a6 beta, CoApp 1.6.3. Perhaps you are encountering a problem with Chrome. Maybe another user here who has Chrome can test this.
It also occurs to me that the Japanese characters in the video name might be causing problems. I changed the target file name to Japanese.mp4 before launching the download. No matter what file name you use during the download, you can change the file name to anything you want after the download completes. Let me know if that makes any difference.
By the way, you should go back to that Table of Contents thread & do another search. This time "stealth quote" is your text search target. That will give you another link you should click. Read that & be sure you remember what that says next time you post.