Found the issue. To reproduce the problem install Python 3.4.0, then rename the install
folder (e.g. C:\Python34 to C:\Python34x) and install Python 3.4.1.
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Installation of 3.4.1 failed on my machine: dialog pops up with "A program required for this install to complete could not be run."
Downloaded from https://www.python.org/ftp/python/3.4.1/python-3.4.1.msi
MD5 correct. I have no log file to see what's missing.
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