Added error checking to detect when a release doesn't exist.
Converted the 'unsupported' platform error to a warning.  The list of platforms appears to be out of date with the actual releases. You shouldn't have these platforms hard coded in the plugin because that kind of information is bound to go out of date really quickly.
Now failing the build if the app failed to copy because the requested platform was not understood.
Better method of selecting the output directory for each requested platform. This uses the the actual platform that was requested as the output dir (eg win32-ia32) instead of just the platform type (eg win32).