Today I just encountered this strange and unbeforeseen problem when downloading the Decide App for a review and thought I’d share how I was able to fix it.
Luckily this is pretty easy and you don’t need to download anything.
Simply head over to the Settings App, and navigate to Settings > General > Reset > Reset All Settings.
Once you’ve pressed Reset All Settings just wait two minutes until your iDevice reboots. You’ll then be able to download any app you choose without a problem.
The Reset All Settings button won’t delete any of your photos, texts or anything else. However you will need to re-enter your Wifi passwords, re-choose your wall paper, and if you have a jailbroken iDevice don’t worry, the only thing I can tell is I have to re-choose my Lockinfo Settings.