Install
The latest release in the gallery supports Visual Studio 2019 and Visual Studio 2017.
No guides after upgrading?
(There is a bug where Visual Studio will reset some settings on upgrade.)
Indent Guides for Visual Studio
See Indent Guides in the Visual Studio Gallery for the latest stable release and end-user QA.
The screenshots are from Indent Guides v13, which looks the same as v16 but has more bugs :)