[issue32545] Unable to install Python 3.7.0a4 on Windows 10 - Error 0x80070643: Failed to install MSI package.

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Amin, it looks like you are trying to upgrade an all-users install of an earlier version of Python 3.7 (one of the betas?) to a just-for-me install.

If you know which older version you have installed, or you can find it in Programs and Features, I'd suggest uninstalling it first. If you can't find it, installing 3.7.0 for all users (go through the Advanced install section) should succeed, and then you can uninstall it if you specifically want a just-for-me install.

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