Install an open-source download manager like Free Download Manager (FDM) or JDownloader. Copy the direct video URL from your browser address bar.
If your browser is frozen due to the 6383 MB file loop, do not click anywhere inside the window.
Malicious extensions often force redirects to fake download portals.
Malicious sites often name a file video.mp4.exe . If your file extensions are hidden, it looks like a video, but opening it executes harmful code. Turn on "File name extensions" in your OS settings to verify.