Hi,
I use AI Professional, bootstrapper which includes all the files and "do not remove extracted files" option.
Sometimes I notice the following broblem: when AdvancedUpdater (or manually) downloads and installs a new version and installs it, after old version removal, Setup reports an error: error accessing .msi file and cannot continue. As the result, there is no new version installed neither the old one. The reason for this is that removal of the older version also removes a new .msi file which replaced an old one by the Bootstrapper.