The reason the installation is failing when you use "allowed-os-versions" on Leopard is because that key is only supported in OS X 10.6.6 and later. The workaround for this is to use a JavaScript function to check for the OS version in the volume check phase of the installation, something like the following: if( system.compareVersions(my.target.systemVersion.ProductVersion, '10.6.6') == -1 ) { my.result.type = 'Fatal'; my.result.message = 'This software requires Mac OS X 10.5 or above'; return(false); } Hope this helps, Ed

I changed the min version by hand just for testing purposes. It was at 2.

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