Fixing "Specified Argument was out of range of valid values. Parameter name: entryvalue"

This error occurs because a cached value is not in the format expected by the Microsoft ClickOnce installer.

To resolve this issue:

1. Close all Outlook windows
2. Open File Explorer and navigate to %localappdata%\apps

Note

You may need to show hidden files and folders to view and delete this folder.

3. There should be a folder named 2.0., delete this folder (this clears the ClickOnce cache)
4. Re-install the add-in