At the current time the add-in is under development and although there is no help available the installation package can be downloaded here:
download Add-In (Add-In no pre-requisites) [3.36 MB]
(version 3.1.0.0 - COM Automation)
download Add-In (Add-In + pre-requisites) [200 MB]
(version 4.0.0.1 - VSTO + Automation + more features)
download Add-In (Add-In no pre-requisites) [5.25 MB]
(version 4.0.0.1 - VSTO + Automation + more features)
The following packages are required for correct functionality of the Add-In:
download .NET 3.5 SP 1 [183 MB]
download Office 2007 PIA [5.71 MB]
download Windows Installer 3.1 [2.40 MB]