iTunes: How to prevent a purchased gigantic app/book from ever downloading? In iTunes, I have purchased some apps and books that are very large in size.

I only purchased them in order to own them, taking advantage of a temporary low price, but I don't plan to use them any time soon.

My internet connection is not very fast and those downloads would take hours.

After purchasing I stopped the download but iTunes will try to download them again when it finds a chance to do so.

I have even deleted the downloads from the downloading list.

But every once in a while iTunes begins to download these gigantic apps/books again.

How can I tell iTunes not to download these purchases EVER unless I explicitly tell otherwise ?
Email iTunes Customer Support - http://www.apple.com/support/itunes/contact/

Request them to 'clear your iTunes download queue'.