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Installing Python 3.8 on PC with Python 3.7. How to do with version conflicts?

On 2019-10-28 19:42, Terry Reedy wrote:
> On 10/28/2019 2:47 PM, MRAB wrote:
>>> On 28/10/19 7:37 AM, Dott. Ugo Donini wrote:
>>>> I cannot use Python 3.8 on my PC with installed Python 3.7.
>>>> Is it possible to update the existing Python 3.7 without reinstalling 
>> If you're using Windows, you'd just install the different Python 
>> versions into different folders: Python37 for Python 3.7 and Python38 
>> for Python 3.8. The installer doesn't that by default.
Oops! Should've been "does that by default".

> The installer puts them into separate directories by default.  The
> default path depends on whether one installs for all users or just one.
> Or one can select the path preceeding 'pythonxy'.  In any case, one can
> use the 'py' launcher to chose which PSF installed python to run.