The software does not require any additional modules to run properly. The only thing it needs is the executable file
md5cksum.exe
which can be located everywhere. If you want the help system also be available then you have to keep the file
md5cksum.chm
in the same folder as the executable. Usually you want to put them in the common program path having their own folder, e.g. "C:\Program Files\MD5Checksum" (on an English Win32 system) and then create a link at an appropriate place manually, e.g. on the desktop or in the Windows taskbar.
Please note that this software is only supposed to run on a common, modern Win32 system with the HTML Help system installed. This should be available in almost every case where Internet Explorer 4.x or higher is available. Win32s on 16bit Windows 3.1 systems or Win64 system, as long as Windows emulation environments might not be able to execute this software properly.