The most effective, safe, and technical method is via Developer Tools. It does not require third-party software, works for most videos under 2 hours, and respects access controls (you still need view permission).
If Method 1 fails, the video is likely segmented (HLS) or DRM-protected, in which case no simple download is possible without breaking encryption—which is not recommended. how to download non downloadable video from google drive
Request download access from the file owner instead of attempting unauthorized retrieval. The most effective, safe, and technical method is