Sideload Office Add-ins on Mac for testing

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We had similar issues on a Mac running High Sierra ver 10.13.1. This path was used to save the manifest file. Create missing folders. Just substitute your account name for <user-account>

/Users/<user-account>/Library/Containers/com.microsoft.Excel/Data/documents/wef

Restart Excel and choose Insert and select Add-ins and select the down arrow to select the add-in.

Hope this helps.

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