It seems like you have provided some text and key information. The key is 'YouTube Video Downloader Pro 6.7.2 for ios instal free'.

If I understand correctly, you are looking for ways to download YouTube videos on your iOS device without paying for the application. Here's a summary of the relevant information:

1. You can use Documents by Readdle, which is a popular and well-rated app that allows you to download and manage files, including YouTube videos.

2. Another option is 4K Video Downloader, which is specifically designed for downloading videos from various platforms, including YouTube.

3. TubeMate is also an alternative, but it's important to note that some users have reported issues with the app's compatibility on iOS devices.

4. VLC Media Player is a free media player that can be used to download and play YouTube videos.

Before you proceed, please ensure that you are aware of the terms of service for each application and the potential risks associated with downloading copyrighted content without permission.

Additionally, if you need help with setting up RealVNC Viewer or Server, I'd be happy to assist you with the installation process using our RealVNC Connect Setup app.