CRT? for visualizer. error

ok, so I just downloaded ue4, got the visualizer downloaded to. start a new project… and now it says Error, needs CRT for visualizer. I looked for the download, but can find it! what have I done wrong?

An error occurred while trying to generate project files.

Running C:/Program Files/Epic Games/UE_4.21/Engine/Binaries/DotNET/UnrealBuildTool.exe -projectfiles -project=“C:/Users/Britonia/Documents/Unreal Projects/test is up/indeedanwisechoice/quickstart/quickstart.uproject” -game -rocket -progress
Discovering modules, targets and source code for project…
Binding IntelliSense data…
WARNING: Exception while generating include data for UE4Editor: Visual Studio 2017 requires the Universal CRT to be installed.
WARNING: Exception while generating include data for StudioEditor: Visual Studio 2017 requires the Universal CRT to be installed.
WARNING: Exception while generating include data for quickstartEditor: Visual Studio 2017 requires the Universal CRT to be installed.
WARNING: Exception while generating include data for quickstartEditor: Visual Studio 2017 requires the Universal CRT to be installed.
Binding IntelliSense data… 100%
Writing project files…
Writing project files… 0%
ERROR: UnrealBuildTool Exception: Visual Studio 2017 requires the Universal CRT to be installed.