Pyinstaller spits out warnings lthat it could not find libraries like api-ms-win-core-* and api-ms-win-crt-*. This leads to an executable working on windows 10, even on a new machine, but not on earlier versions as pyinstaller fails to bundle the needed files.

The fix is quite simple:

1. Download Visual Studio 2017 community from microsoft website
2. Install following components:
   Windows Universal CRT SDK
   Windows 8.1 SDK
   VC++ 2015.3 v140 toolset for desktop
   Windows Universal C Runtime
3. When invoking pyinstaller use
   –path "C:\Program Files (x86)\Windows Kits\10\Redist\ucrt\DLLs\x86"

Done 🙂

well the path is for the 32bit libraries, guess what, replace DLLs\x86 with DLLs\x64 when using python 64bit

OR install Visual C++ 2017 Redist package on the destination machine.

If the packaged application still does not run please install the mentioned redist package