Android 4.4.2 KitKat was released in 2013. Most modern apps require Android 6.0 or higher to function because they use newer programming libraries. If you try to install the latest version of YouTube on a KitKat device, you will encounter a Parsing Error. To get YouTube working, you must find the "last compatible version," which is typically version 14.43.55. Steps to Download and Install YouTube APK
NewPipe Legacy: NewPipe is a popular open-source YouTube client. They maintain a "Legacy" version specifically for older Android versions like 4.1 through 4.4. It is ad-free and very fast. Is it Safe to Use Old Versions?
Google Play Services Error: YouTube relies heavily on Google Play Services. If your Play Services version is too old, YouTube won't sign in. You may need to manually find and install a KitKat-compatible version of Google Play Services APK as well.