I am currently working on a Excel 2010 add-in and I've managed to create a Windows Installer project for it which is installing the add-in successfully on any machine. However, I am facing an issue: in order to install a new version of the add-in I have to first uninstall the previous one... 
In the Windows Installer project I've set the RemovePreviousVersions property to True, but this didn't help in any way... 
In order to create the MSI I've used this guide which doesn't mention anything about updates... <http://msdn.microsoft.com/en-us/library/ff937654.aspx>

Any ideas and suggestions would be appreciated!

Thank you!