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Outlook Add-In Installation Error: 0x80004001

When I try to install the Less Meeting Outlook plugin, an error appears:

LessMeetingOutlookInstallError

Visual Studio Tools for Office Solution Installer

The following Microsoft Office solution cannot be installed due to a general installer error: LessMeeting.OutlookClient.vsto

0x800004001

The solution is to download and run the Microsoft Visual Studio 2010 Tools for Office Runtime located here.

Full documentation of the issue can be found at this Microsoft support article.