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Add-In Not Visible in Excel 2013 - me too


I installed this in Excel 2013, as explained in the instructions, but the add-in does not show up anywhere in the ribbon interface tabs in Excel. The sample spreadsheets load properly in Excel, but get the foloowing message:

The Ribbon/COM Add-in helper required by add-in PMStockQuote Excel Add-In could not be registered.
This is an unexpected error.
Error message: Exception has been thrown by the target of an invocation.

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