*** Instructions for Mac OSX (from El Capitan to Catalina) ***
1) Download and unzip the file named FFMPEG-3.2-Mac.zip file provided here. It contains a folder named "ffmpeg-3.2"
2) Copy this folder to /Users/yourusername/Library/Application Support/FB360 Spatial Workstation/
3) If Finder does not show the Library folder, when you are in /Users/yourusername folder press the keys cmd+shift+.
4) The final result should be:
/Users/yourusername/Library/Application Support/FB360 Spatial Workstation/ffmpeg-3.2 as shown in this screenshot:
http://www.angelofarina.it/Public/FB360/Screenshot%202022-04-27%20at%2000.29.47.png

*** Instructions for Mac OS Big Sur and Monterey (Intel machines only) ***
1) Download the ZIP file named FFMPEG-3.4-Big-Sur.zip
2) Unzip it, then copy and paste the whole folder ffmpeg@3.4 into the directory usr/local/Cellar. 
3) If Finder does not show the /usr folder, when you are in the root of your disk (/) press the keys cmd+shift+.
4) The final result should be:
/usr/local/Cellar/ffmpeg@3.4/3.4.2 as shown in this screenshot:
http://www.angelofarina.it/Public/FB360/Screenshot%202022-04-27%20at%2000.42.40.png

Last trick: on some Mac computers you could need to install both versions of FFMPEG, 3.2 and 3.4, as described above.