Current 4.1 user. I'd like to upgrade to 4.2. The Docs say To install Plesk Sitebuilder using Autoinstaller: 1. Download the Autoinstaller package for your OS from Parallels web site. 2. Run and Autoinstaller and select the Sitebuilder 4.2.0 component. I have a copy of the file on my desktop. How do I "run" it?