Latest SSDT-BI won't install in Visual Studio 2017 15.7.5

Just upgraded my Visual Studio 2017 to version 15.7.5, Then got latest SSDT-BI standalone installer.

However running that installer failed (the installer displayed the message, "Setup Failed, unknown error") and totally borked my VS installation. Only remedy was to install a stand-alone version of VS using the download.

Any ideas/fixes?

Key section of log:

Error 0x80131509: Process returned error: 0x80131509 Error 0x80131509: Failed to execute EXE package. Error 0x80131509: Failed to configure per-machine EXE package. MainViewModel.OnPackageAction: Install Completed for package SQL Server Analysis Services (id: Applied execute package: Microsoft.DataTools.AnalysisServices, result: 0x80131509, restart: None Error 0x80131509: Failed to execute EXE package.

I can't post the whole log from work (firewall restrictions).