Install Error 0x80070643 - Rhino 6

e000: Error 0x80070643: Failed to install MSI package.

Summary: How to fix the installation Error 0x80070643

Problem

Rhino fails to install. The Installation.log file contains the line:

e000: Error 0x80070643: Failed to install MSI package.

Answer

This is a problem with the Microsoft .NET framework. Download the Microsoft .NET Framework Repair Tool to repair the the .NET Framework as covered in this article: https://support.microsoft.com/en-us/help/976982/net-framework-update-installation-error-0x80070643-or-0x643

Then re-install Rhino.