Google has deprecated the authentication API that YouTube 4.3 uses. Trying to sign in typically results in “Couldn’t sign in” or a blank browser window. Without login: no subscriptions, no history, no recommendations tailored to you.
Looking for a typically leads users toward one of two things: a legacy version of the official Google app for very old devices or a specific third-party downloader that shares a similar version number. 1. Official YouTube 4.3.9 (Legacy) youtube 4.3 apk download
Yes – but sideload it on an emulator or a spare phone, not your daily driver. Google has deprecated the authentication API that YouTube 4