The MSI file is much like the ISO image with two main exceptions:

1. You do not 'mount' the MSI image, just double click it
2. It does NOT include the prerequisites that the ISO image installs, therefore you must have the following already installed:
• .NET 2.0 Framework
• Microsoft Windows Installer 3.0 (See article Q12918)
• Microsoft Security Update MS04-011

Once you have downloaded the MSI image, double click it and you will see the following screen:

(NOTE: If you have a previous version of this already install, step through the screens to Remove the old version first)

Now you can continue installation with the next screen being the EULA, the same as if you are installing from ISO image (see kb article Q12520)