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Microsoft Visual Studio Tools for Office 2010 (VSTO) fails to install

VSTO is a necessary component for the TimeSheet Reporter Outlook User Agent (OUA) and if it is not already installed, it will be downloaded automatically and installed when the OUA is installed.
In very rare situations security software such as anti virus software prevents VSTO from downloading and you must therefore install it manually.

Symptoms

You get the following message:
Component Microsoft Visual Studio 2010 Tools for Office Runtime (x86 and x64) has failed to install with the following error message:
“Fatal error during installation. “
The following components failed to install:
– Microsoft Visual Studio 2010 Tools for Office Runtime (x86 and x64)
See the setup log file located at [log file location differs from computer to computer] for more information.

Fix

Download VSTO manually and install it. When that has finished, you must repeat the installation of OUA.
VSTO can be downloaded from Microsoft here.