[3.9] bpo-41412 and bpo-40948: Windows installer updates (GH-21656)#21661
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Prevent installation on Windows 8 and earlier.
Download UCRT on demand when required (non-updated Windows 8.1 only)
Add reference to py launcher to post-install message
(cherry picked from commit 37a06cb)
Co-authored-by: Steve Dower steve.dower@python.org
https://bugs.python.org/issue41412