On a recent InstallShield 2009 installation, the InstallShield Updater finds many updates for itself. This is not unusual for a software application. But in addition to SP1 and SP2, there some dozen or so additional updates / *NEW* downloads.
These "New" downloads are available on the installation DVD for InstallShield and don't need to be downloaded. Whether or not you install them will depend upon your install authoring needs. I think the link on the InstallShield DVD for these is titled "Additional Installs" or something like that.
Personally, I have installed many of them as I author both pure InstallScript and pure basic MSI projects.
Service Packs and critical hotfixes are important. Check the Knowledge Base regularly to be informed about new hotfixes and patches. Or subscribe to the RSS feed.
