Go to Settings > Security and check the box for "Unknown Sources" to allow the installation of apps outside the Play Store.

You downloaded the wrong architecture (e.g., ARM64 on a 32-bit processor). Fix: Download the “Universal” or “ARMv7” legacy build.

It seems you're looking for a of VLC Media Player for Android, specifically related to an "Android 444 link" — which likely refers to Android 4.4.4 (KitKat) .

[insert actual link or mention that the link is provided in comments]