A Revit Add-in Template for Visual Sudio that can point to multiple versions of Revit at the same time. This template uses configurations and generate separate dll files for each bersion.
Create new project in Visual Studio and select the template from the list.
Select the version of Revit in the list of configurations
By starting project you'll trigger a new session of Revit attached to the template
Develop you plugin and have fun ;)
After installing the extension, you can create a new project by selecting the Revit Multiversion Addin Template from the list of templates in Visual Studio:
To run the project, select the version of Revit you want to run the plugin in the list of configurations and hit play button: