Based on your key request 'install the new version for apple MKVToolnix 81.0.0', I've analyzed the provided text to gather more information.

Here's what I found:

1. The latest available version of MKVToolNix is 82.0, not 81.0.0.

2. The software is open-source and can be downloaded, installed, and distributed freely under the GPLv3 license.

3. The application is cross-platform, meaning it will work on Apple macOS (and also Microsoft Windows and Linux operating systems).

4. Upon installation of MKVToolNix 78.0, any opened MKV files would automatically add to a new MKVToolNix window.

Given this information, I can provide you with the following suggestions:

1. Since the latest available version is 82.0, you may want to consider installing that instead of 81.0.0 (as it's not available).

2. As the software is open-source and free, you can download and install MKVToolNix from the official website or other trusted sources.

3. The cross-platform nature of the application means you can use it on your Apple device without any compatibility issues.

Would you like me to help with installing the latest version (82.0) or provide more information about using MKVToolNix on your Apple device?

Instal the new version for apple MKVToolnix 81.0.0