Update iMovie - Store wants to download full app, not an update package

I want to update iMove from 9.0.1 (purchased via the App Store) to 9.0.2 (because we are getting an audio sync problem on exported movies for which this update says it has a fix). From the web update page I downloaded the iMoview9.0.2Update.pkg and got a 27.5MB file but, on running it, it says I have to update via the App Store. But the App Store wants billing information and then starts to download a 500MB+ file which is presumably the full application so I immediately stopped the download because I am in a remote area on a low-speed satellite connection with a 3GB monthly limit.
Am I stuck with downloading the full 500MB+ file by going through the App Store? Was I about to be charged for the app again?
Thanks - Cathy.

It appears from my recent experience that updates are a full new version of the app in question. So after it verifies your account as the one who "owns" the license to use the app, it will not recharge you for the app, but will then allow its download. This is good for you because it means no one in your household can be willy nilly using your download allotment without your knowledge to update apps if they do not have access to your iTunes/MAS account information.
You may want to check the size of installed apps before proceeding with the update so as to stay within your download allotment in a given ISP billing period.
Dah•veed

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