The firmware updater program is written in Qt. There is a known issue of current Qt’s SerialPort class crashing in MacOS 10.9.5 or 10.10 (https://bugreports.qt-project.org/browse/QTBUG-42037). Fixing it requires re-compiling the SerialPort library, which I haven’t had time to do yet. Good to hear that you got it working on Win7, and thanks for posting the picture. Looks nice!