> Let me know if you are unable to reproduce it.

x64 pythonw.exe and pyw.exe (3.7.5, 2019-10-14) work for me in Windows 10.0.18362. I have them installed for all users, respectively in "C:\Program Files\Python37" and "C:\Windows". 

Try running `pythonw.exe -m idlelib` and `pythonw.exe -m turtle`. If nothing runs, try it with python.exe, just to make sure tcl/tk and IDLE are installed.

> How do I have multiple MINOR versions of python together? 
> e.g. 3.7.3, 3.7.4, 3.7.5?  Can they be placed in separate 
> folders?

The standard distribution supports one major-version installation for the system and another per user. You can use the nuget packages to test against multiple minor versions.

https://docs.python.org/3/using/windows.html#the-nuget-org-packages

It seems that nuget packages can also be installed via PowerShell 6. However, the "Version" parameter of Visual Studio's Install-Package changes to "RequiredVersion" in PowerShell 6.