This project generates an addin to Revit and made using revit 2024. As such if you are using an older version of revit you may have to manually move the "RevitAddinCRH.addin" and "RevitAddinCRH.dll" to you addin-folder. which is usually located at %AppData%\Roaming\Autodesk\Revit\addins"versionNumber".
if you are using one of the following versions, Then the Build events should automaticly move newly compiled addin to the specified folder. Revit 2024: Supported Revit 2023: likely supported, but untested Revit 2019: likely supported, but untested Revit 2018: likely supported, but untested Revit 2017: likely unsupported, but untested Revit 2016: likely unsupported, but untested
otherwise you will find a copy of the .addin and .dll files at $(ProjectDir)\Output