Failed Install of SSDT for Visual Studio 2017

I am trying to install SSDT for VS 2017 (15.5.1), and I get this error:

"The requested metafile operation is not support (0x800707D3)".

The Microsoft page states that this was fixed in the current release but apparently that isn't true. From Microsoft's change log: Fix an issue where setup fails with the following error message:

"The requested metafile operation is not support (0x800707D3)".

I have Visual 2017 installed and working and all updates to it have been installed

I am running Windows 7 Enterprise (company machine out of my control)

Has anyone figured out a work around?

https://docs.microsoft.com/en-us/sql/ssdt/changelog-for-sql-server-data-tools-ssdt

The method I successfully used after encountering the failure message cited above was to uninstall the Visual Studio 2015 shell using add / remove programs (Win 10 Pro); rebooting, and then reinstalling SSDT for Visual Studio 2017 (Community Ed).

I am not sure how the Visual Studio 2015 Shell got installed: I previously removed all prior versions of SQL Server, and Visual Studio from the machine. I did build out the machine again by first installing SQL Server 2017 Dev, Visual Studio 2017 Comm Ed.