Install Older Versions of Python (How-to)

[@mahiashafa3474]

Thank you so much for sharing this, it has helped me a lot!!

[@LearnEDU]

Glad it helped!

[@yashpisat9267]

I am not able to install python 3.6 following this steps, it throws an error in the fist step itself configure: error: Unexpected output of 'arch' on OSX