This is the biggest issue. Old software contains unpatched exploits. Any website offering a is likely a minefield. Common threats include:

Several third-party downloader tools have version histories that include a "2.1.6" or similar designation:

For historical curiosity or running inside a virtual machine, yes. For daily, reliable downloading in 2025, no.

A very small package size of approximately 815 KB , significantly smaller than modern versions. Alternatives and Safety Risks

: Allows saving as AVI , MPEG , or MP3 .

A highly popular choices for users who want simplicity. The free version allows a generous number of daily downloads with an interface that closely mirrors classic 2010-era utility programs.

I can give you step-by-step instructions for the safest tool. Share public link

Version 2.1.6 was coded before major SSL/TLS updates. YouTube now uses TLS 1.2/1.3 encryption. Old software may use outdated libraries susceptible to man-in-the-middle attacks.

Version 2.1 of this extension was released in August 2025.

: Version 2.1.6 was released around 2014 for Android 2.2 (Froyo). It is available on APKMirror but will likely not connect to modern YouTube servers.

I can provide direct troubleshooting or recommend a safe, working alternative tailored to your system. Share public link

The only official and legal way to download for offline viewing.

If you want to choose the best option for your setup, let me know: Your (Windows, Mac, Linux?)

Safe Ways to Download Older YouTube Videos: A Complete Guide

Avoid sketchy forums or unverified file-sharing links. Instead, look for reputable tech archiving platforms such as: OldVersion.com FileHippo (Legacy Section) The Internet Archive (Archive.org) 2. Verify the File Integrity