Pyinstaller onefile does not start on some Windows 7 machines

Question

I have created an exe file which works fine on some Windows machines and fails on others.

I could not yet find the cause for failing.

Important data:

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Answer 1

There's a discussion about this here working towards a build side solution rather than having to install the Windows Update: https://github.com/pyinstaller/pyinstaller/issues/1566 . As of today (9th May 2017) there's still no firm solution. There are 2 solutions that have worked for some people:

• Install the Windows 10 SDK and add the ucrt DDL dirs to your system path (C:\Program Files\Windows Kits\10\Redist\ucrt or C:\Program Files (x86)\Windows Kits\10\Redist\ucrt\DLLs\x64 depending on your system) before building

• Use Python 3.4 to build instead of 3.5+

Answer 2

After installing around 200 Windows updates the error is gone.

The required update is addressed by KB2999226