[issue20807] 3.4 cherry pick: 82ec02db7fe6 & ec42ab5e0cb3 Windows installer fixes

[STINNER Victor]

STINNER Victor added the comment:

If I understood correctly, Python 3.4 cannot be uninstalled if pip was upgraded. IMO this bug is critical and must be fixed in Python 3.4.0.

But be careful, the fix has also a bug: it requires changeset 16f91d87ff39 (see cherry-pick issue #20830).

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