The extension has been rebuild foe VS2017 thus there uis a good chance it may not work on older versions of VS. For older (pre VS2017) releases please visit https://github.com/oleg-shilo/Retired-VSIX.
Please use the CodePlex (link above) for any error reports and feedback.
Many documentation authoring tools do excellent job but fall short assisting with the actual development of the documentation - editing XML code comments.
DocPreview is different. It provides an instantaneous preview of a given single XML comments block. DocPreview assists with validating the user input for being compatible with the documentation authoring tools (e.g. Sandcastle). Thus developer can efficiently modify the content to deal with the typical editing problems (e.g. typos, misspells).
Special thanks to Marek Stoj, author of ImmDoc.NET.
Using DocPreview is straight forward. Open the preview window from Menu->View->Other Windows->Xml documentation preview.
Now if you place the cursor inside of the XML code comments the documentation preview will be rendered when you press the refresh icon/button. Alternatively you can tick the 'Auto refresh' checkbox and the preview will be generated automatically when the active document current line is changed.
The below is the screenshot that illustrates the use of DocPreview: