Security: Unsigned File or Add-In

When you try to load an executable file or add-in, a dialog displays asking you to verify its publisher.

Issue: This executable file or add-in has a valid signature ensuring that it has not been tampered with since it was signed by the publisher. Before Revit will run the executable or add-in, you need to determine whether you trust this publisher.

Solution: Choose the appropriate option:

Caution: Load the file only if you trust the publisher who provided it.