After updating iOS 8.1.3, I tried to download, but getting error \"Unable to download app\" and \"could not be installed at this time\" mes
I have the same issue and this happens for the applications that doesn't have any entitlements.
Re-signing the app with entitlement solved the issue for me, but this is going to be pain as all the applications that are already deployed need to be re-signed and deployed.
This is a weird issue because these apps which failed for me doesn't use anything like keychain sharing or push notifications and hence doesn't need an entitlement at all (as per my understanding). Now when I just add an entitlement with keychain-sharing it starts working.