Last Updated: Sep 12,2010
Where can I find the .apk files from the apps I've bought?
i do not think you can but you can save apk files, download "appSaver", it saves the apk file for apps that dont block this feature, for example you cant app save some apps like "ESPN Fantasy Football", or "Homerun Battle 3D" and so on.
appSaver - Android app on AppBrain
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