osx elcapitan - Python on OSX 10.11: Installation failed - no software found to install -

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starting python course via udemy. trying install python 3.2.3 (used in course) 64-bit on osx 10.11.1, running dmg produces msg saying installation failed not find software install. goes wrong? have installed python (other versions , on earlier osx-version), , have never encountered problem. suggestions re how around this?

picture of installation failure message


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