Typically we have the new version of Bonus Tools ready before the next version of Revit is rolled out. As part of an Exchange APP publisher we are given the ability to upgrade our API's prior to the next release of Revit. ...

What does this mean: Error: System.InvalidCastException: Unable to cast COM object of type 'Microsoft.Office.Interop.Excel.ApplicationClass' to interface type 'Microsoft.Office.Interop.Excel._Application'.   In short this is a Microsoft issue, and has been since I started B ...