Install the App

1. Press Command+Space and type Terminal and press enter/return key.
2. Run in Terminal app:
   ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null
   and press enter/return key. Wait for the command to finish.
3. Run:
   brew install testdisk

bron: http://macappstore.org/testdisk/