MkvInjector is a tool for injecting resources like subtitles and audio to mkv files. Copy script to destination directory with mkv files, subtitles, audio or other resources and run. Be informed that all resources should have the same name as target mkv container.
Here you can find packaged script with included python and ffmpeg inside.
Download Python executable installer for windows:
https://www.python.org/downloads/windows
Python should be associated with '.py' extention.
Download ffmpeg installer for windows with static linking:
https://www.ffmpeg.org/download.html
Add ffmpeg to windows path:
https://www.wdiaz.org/how-to-install-ffmpeg-on-windows/
Install Python and ffmpeg: You can use a packager like Homebrew to find these packages.
brew install python ffmpeg
Install Python and ffmpeg:
apt-get install python ffmpeg