Mac Sierra FreeCAD Installation
Welcome Mac User! And this is Tutorial Shows You Step-by-Step How-to Install FreeCAD on Mac Sierra 10.12 OS X.
And FreeCAD for MacOS 10.12 is a Free CAD is a Parametric 3D Modeler made primarily to design real-life objects of any size.
Finally included in this is guide also instructions to Getting-Started with FreeCAD Software on Mac OS X.

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Download FreeCAD Software for MacOS
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Then Double-Click to Mount the Image
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Next Drag & Drop into Applications
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Finally Launch & Enjoy FreeCAD on Mac
Mac Sierra Solving Package from Unidentified Developer Issue:
Also Right-Click on Package & Open.
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How to Getting-Started with FreeCAD on Mac