He worked for a while, but it doesn't appear they are updating the converter anymore. For simple video conversions, compressions, it works pretty well. The interfaces a little Antiquated and functionality is limited. One issue I have in particular is the software can't properly recognized files that have a dot in it.
For example:
"1. Welcome to the course.mp4" will be renamed to "1.mp4".
"Using Web3.0 in your business.mp4 becomes "Using Web3.mp4

When you have hundreds of files to convert, it becomes impossible to change all these file names manually.

Also, it doesn't appear that it has stayed up to date with the latest YouTube updates for downloading videos.