In fact, the UI is comprised of a single, medium-size window that features very intuitive fields. Even though it is not exactly eye-candy, the interface is user-friendly and unlikely to cause you any real troubles while navigating.However, in case you are having a hard time accessing the file, then you should consider Unblocking the tool from Properties in the context menu.
Since the application comes in a portable package, the setup is a quick matter of decompressing the archive in the desired location on your hard disk.