CR_Documentor 18.104.22.168 is in the Visual Studio Gallery
You can either get it from the gallery, or, from the Visual Studio Extension Manager, search for "documentor," "dxcore," "coderush," or other related terms and it'll come up.
It's a full VSIX installer, so it'll install right into Visual Studio without you needing to download, unzip, or do anything additional.
(I think I'm the first DXCore plugin with a VSIX installer to appear in the gallery, so... I have to say, I'm a little proud. Huge props to the DevExpress folks who made this possible.)