The Error Message During Install

My system is Windows 7 Professional SP1. I had downloaded and successfully installed python-3.5.2-amd64.exe and python-3.6.0 from Python official website.

By calling "python" console, "pip install" and run some other commands in the windows console, I confirmed both of those 2 Python installation is successful.

Next I tried to download and install the Pillow-3.4.2.win-amd64-py3.5.exe, but an error is encountered:
"Python version 3.5-32 required, which was not found in the registry. "

At this time, I clicked "Ok" button to route to the next step, I can see both "Python Directory" and "Installation Directory" both are blank.

Some Failed Attempts

So I search my registry, I can see both 2 python are existing:

• HKEY_CURRENT_USER\Software\Python\PythonCore\3.5\

This set contains a value "Python 3.5" for the key:

• HKEY_CURRENT_USER\Software\Python\PythonCore\3.5\InstallPath\InstallGroup

and the 3.6 also has the correct key with its values.

• HKEY_CURRENT_USER\Software\Python\PythonCore\3.6...

After search few days of google and stack overflow, I copied those 2 registry key sets fully into HKEY_LOCAL_MACHINE as following:

• HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Python\PythonCore\3.5...
• HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Python\PythonCore\3.6...

Somehow the Pillow 3.4.2 installer is still populate the same error with same message.

Could someone look into this issue?