Audacity 213 FFMpeg not found

Dear All
I walk through many forums. I tried to apply proposed fixes but doesn’t work.
I loaded a new FFMpeg files from the linked shared on Audacity. Unzipped it. I made some experiments with placing dynamic libraries in the different folders.
It doesn’t help
System don’t want to recognised file
Even when I placed it at /Applications/Audacity/libavformat.52.dylib and pointed to this file in Preferences.

I also repaired all rights on the system.

MacOS 10.12.6 MacOS Sierra

Any idea?