After installation on your platform of choice, please put the files 1) utils.py in * MacOS: /Applications/McStas-2.4pre01.app/Contents/Resources/mcstas/2.4pre01/tools/Python/mccodelib/ * Debian/Ubuntu Linux: /usr/share/mcstas/2.4pre01/tools/Python/mccodelib/ * RedHat, CentOS Linux: /usr/local/mcstas/2.4pre01/tools/Python/mccodelib/ * Windows: c:\mcstas-2.4pre01\lib\tools\Python\mccodelib\ 2) mcgui.py in * MacOS: /Applications/McStas-2.4pre01.app/Contents/Resources/mcstas/2.4pre01/tools/Python/mcgui/ * Debian/Ubuntu Linux: /usr/share/mcstas/2.4pre01/tools/Python/mcgui/ * RedHat, CentOS Linux: /usr/local/mcstas/2.4pre01/tools/Python/mcgui/ * Windows: c:\mcstas-2.4pre01\lib\tools\Python\mcgui\ 3) mcdisplay.py in * MacOS: /Applications/McStas-2.4pre01.app/Contents/Resources/mcstas/2.4pre01/tools/Python/mcdisplay/pyqtgraph/ * Debian/Ubuntu Linux: /usr/share/mcstas/2.4pre01/tools/Python/mcdisplay/pyqtgraph/ * RedHat, CentOS Linux: /usr/local/mcstas/2.4pre01/tools/Python/mcdisplay/pyqtgraph/ * Windows: c:\mcstas-2.4pre01\lib\tools\Python\mcdisplay\pyqtgraph\ 4) optimisation.py in * MacOS: /Applications/McStas-2.4pre01.app/Contents/Resources/mcstas/2.4pre01/tools/Python/mcrun/ * Debian/Ubuntu Linux: /usr/share/mcstas/2.4pre01/tools/Python/mcrun/ * RedHat, CentOS Linux: /usr/local/mcstas/2.4pre01/tools/Python/mcrun/ * Windows: c:\mcstas-2.4pre01\lib\tools\Python\mcrun\