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To install SeqTrace on a Mac you will need to download the PyGTK package from OSX.   http://sourceforge.net/projects/macpkg/files/PyGTK/2.24.0/PyGTK.pkg/download  Confirm that you have Python version 2.7x. 2.7x or earlier. You can do this by typing  - python --version  If not, download the appropriate version. seek help to invoke an earlier version directly.  http://www.python.org/download/releases/  After downloading and unpacking the program, SeqTrace is ready to go. SeqTrace must be launched from a Terminal window. For a refresher or introduction to the Terminal see section II. Move SeqTrace to your Applications folder.