* #4458 MSI installer checks that the Windows C Runtime and VS Studio 2015 C++ redistributables are present and returns error message if not.
Includes tests to check that the Wix file contains the download URLs and those URLs are not dead.
Added a checkbox (unchecked by default) to the last dialogue of the Windows installer to provide the option of opening PowerShell because that's what most people want to do if they installed PowerShell.