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I changed my phone so that it could receive unknown sources for the Spotify android app preview. But when I attempt to download it it says it was unsuccessful. What am I doing wrong here?
Moved your post the a new thread as it was nothing to do with the topic in the thread you posted it in.
Try again while connected to wifi (or while on 3G if you were previously on wifi).
If that doesn't work then download it to your PC and transfer the file to the phone over USB