If you prefer to stay within official app stores, consider these secure options:
Run the downloaded file and follow the prompts. If you prefer to stay within official app
TubeMate is a popular utility tool designed primarily for Android and Windows that allows users to download videos and audio from various platforms for offline viewing. It is widely used for: If you prefer to stay within official app
On Android, navigate to Settings > Security and allow "Install from Unknown Sources". If you prefer to stay within official app
The official way to download videos for offline play directly within the YouTube app.