Currently, only a .zip file is provided for the Windows platform. This means you have to set up your path variable to point to the directory into which you have unzipped mtf_mapper.exe.
In a command prompt window (DOS box), you can add the relevant path temporarily using the following:
set PATH=%PATH%;c:\workspace\mtf_mapper_0.3
where c:\workspace\mtf_mapper_0.3 denotes the directory where mtf_mapper.exe is located.
If you have not installed gnuplot already, you should add the gnuplot subdirectory to the PATH too, e.g.,
set PATH=%PATH%;c:\workspace\mtf_mapper_0.3;c:\workspace\mtf_mapper_0.3\gnuplot
You can of course make these changes to your PATH environment variable persistent by using the appropriate dialog in the control panel (see windows 7 path).
By default, mtf_mapper_gui will configure (and save) the locations of the helper tools (gnuplot and exiv2) upon first start-up. Next time when you start mtf_mapper_gui, it will use the path stored in the settings file. This means that under normal operation, you will not have to worry about the location of the helper applications. Should you copy or move mtf_mapper to a different folder, you will have to update the locations of the helper programs using the fields provided in the settings diaglog. These settings will be saved for future runs too.