For OSX, in theory, you simply copy the app file from the zip into your Applications folder or Desktop folder. However, OSX can be a challenge with every new release of the OS. If doing that does not work in isolation (which it probably will not), do one (or both) of the following:
It is important to ensure you apply executable permission via the Terminal to the binary file INSIDE the app file. So, using the terminal type the following wherever you downloaded the app file to. i.e.
chmod +x Quickhash-GUI.app/Contents/MacOS/Quickhash-GUI
That applies executable permission to the binary part of the app bundle.
Also, you may need to still allow the application to run via your system preferences –> System and Security (or press the option key and then double click the app). Usually, if you have attempted to launch it once already, if you go to the System and Security settings, it will actually show you that OSX blocked the app from running and whether you should allow it or not. No libraries ship with the Apple version anymore, for v3.3.0 upwards, because any dependencies are looked up from the OSX dynamic cache now.
