The archive includes all software needed to run McStas, including perl, a c-compiler, a vrml viewer and Scilab for data plotting.
Installation of all the provided support tools is needed to get a fully functional McStas. The option not to install some of the tools is only included for people who have one or more tools installed already.
The safe and fully tested configuration/installation is to install all tools, leaving all installation defaults untouched. Specifically you may experience problems if you install to non-standard locations.
Simply follow the guidance given by the installer, pressing 'next' all the way.
If you experience any problems, or have some questions or ideas concerning McStas, please contact peter.willendup@risoe.dk or the McStas mailing list at neutron-mc@risoe.dk.