To install the application run the file FreeVideoToMP3Setup.exe.
Press the "Next" button in the first screen.
Afterwards, select the directory where the application will be installed, or simply accept the default one and press the "Next" button.
After the application is installed you can start it by clicking the Free Video To MP3 shortcut icon on the desktop or by selecting the Free Video To MP3 shortcut from the Windows start menu.
Some of our software use an executable of FFmpeg licensed under the LGPLv2.1 and its source can be downloaded here