Question about disconnectible apps..

I have an Office XP MSI Application Object. The app currently is not
disconnectable, but to make use of addon images for a certain
percentage of our userbase, I need to mark the app disconnectible, or
the addon gets purged from cache on initial login.

My question is, for the uses that will not be getting the application
addon image, when the app launches, will it try to cache the whole
installer before it installs Office XP?

I really don't want to drop 600+ MB on the boxes without addon images,
if I don't have to.