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Downloading the latest version of Google Chrome on is not possible because modern versions of Chrome require much newer hardware and software (typically iOS 15 or later). Google Help
Download the last compatible version
If you open the App Store on your device running iOS 9.3.5 and search for "Chrome," Apple will offer the last compatible version (likely Chrome 70–80 range from around 2017–2018).
iOS 9.3.5
In the fast-paced world of mobile technology, software moves forward relentlessly. For users holding onto older but beloved Apple devices—specifically the iPhone 4s, iPhone 5, iPhone 5c, iPad 2, iPad 3rd generation, iPad mini 1st generation, or iPod touch 5th generation—you are likely stuck on or 9.3.6 .
Finally, warn them about downloading from unofficial sources, as those could be malicious. Emphasize that the App Store is the only official source for Chrome, and older versions aren't listed there. If they're stuck with iOS 9 for some reason, maybe they can try Safari with some workarounds, but it's not ideal.
Here is the detailed explanation regarding the compatibility and your options:
