The term "portable" is used loosely. Android is not a portable operating system like Windows (where a portable app runs from a USB stick). However, for Android 4.4.2, "portable" implies three things:
Old KitKat devices often have weird audio drivers. Go to:
Settings > Audio > Audio Output → Change from "Automatic" to OpenSL ES. This prevents audio desync in MKV files. vlc media player android 442 apk portable
You are running an Android version from 2013. No modern security patches exist for Android 4.4.2 itself. However, VLC does not increase your risk. The term "portable" is used loosely
Unlike streaming apps (Netflix, YouTube) that cache gigabytes of data, VLC in "portable mode" means: Go to: Settings > Audio > Audio Output
VLC is famous for playing anything: .MKV, .AVI, .MP4, .FLAC, you name it. On KitKat, the latest VLC from the Play Store might stutter or fail to install. The solution is the VLC 3.5.x legacy build—the final stable version that supports API 19 (Android 4.4+).
Not every version of VLC works on KitKat. VideoLAN dropped official support for Android 4.4 after version 3.5.4. If you attempt to install VLC 4.0 or newer, you will receive a "Parse Error" or "App not installed."