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 
    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

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