On a Mac, scroll to the following location to find IPA files.
~ / Music / iTunes / Mobile Applications /
That's all you need to do.If these IPA files are downloaded and stored on the screen, you can move them elsewhere.Remember that an IPA file is not the same as an IPSW file.IPA file is just an application.If you lose it, not a big deal.However, the IPSW file on the other hand is a backup of your iPhone or iPad.You certainly won't want to mislead these files.
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