how to detect the requested free game has been downloaded ?

In order to encourage game players to download my lite version game, I would like to put up a button on my game one. Clicking on the button will bring up my game two in App store for game players to download. The problem is how do I know game player has finished the download of game two, so I can unlock some features for them in my game one as reward for dowloading my game two. Appreciate any help.

views:1616 update：2011/9/25 12:40:18


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