Before downloading copyrighted content, test the tool with a known free video (e.g., a Blender Foundation movie like "Big Buck Bunny"). If it downloads correctly, great. If you get errors, the tool is too old to work with YouTube’s current API.
If you are a developer or retro-computing enthusiast who absolutely needs to run version 2.1.6 in an isolated environment: youtube downloader old version 2.1 6 free download
You can find the archived APK on platforms like APKMirror or the Internet Archive . Before downloading copyrighted content, test the tool with