Eryk Sun added the comment: The error message is misleading. It happens that WiX is trying to run an elevated process (see the WiX functions CoreLaunchApprovedExe, CoreElevate, ElevationElevate, and PipeLaunchChildProcess). However, the actual error code has nothing to do with elevation. Error code 0x80070003 is a 32-bit HRESULT error originating from the Windows API (0x8007). The 16-bit Windows error is ERROR_PATH_NOT_FOUND (0x0003). According to the installation log, this error is from trying to shell execute "C:\Users\ALEVON~1\AppData\Local\Temp\{8D001A8F-7F1F-4183-A574-76127D642F75}\.be\python-3.5.3-amd64.exe". Notably the error is in the path instead of ERROR_FILE_NOT_FOUND (0x0002), so the problem may have been that one of the parent directories was missing.
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