Why do I get an 'SDK seems invalid' error when setting up my Project Interpreter in PyCharm?

Question

I try to set up project interpteter Python 3.5 in Pycharm and get an SDK error

Answer 1

Operating system: Windows 10 / cygwin

Desired Python: 2.7.14

Error: "SDK seems invalid"

My fix:

1. Remove Python 64 bit version
   2. Install Python 32 bit version
   3. using the windows environment variable dialog set PY_HOME={somedrive}\{somepath}\Python27
      PYTHONPATH={somedrive}\{somepath}\Python27

note: I guess it works since the errors I see are python generated eg "Traceback (most recent call last): File ..."