Assuming iOS 9 doesn't harbor show-stopping bugs -- as did 2014's iOS 8 -- it will be an uptake improvement over its predecessor, predicted Crittercism, a vendor that markets a platform that tracks crash data to app makers. Like Mixpanel, Crittercism can detect the iOS edition being run by a device.
Using past data, Crittercism earlier this week predicted that iOS 9 would be adopted at a faster pace than was iOS 8, reaching 20% by Day 4, or early Sunday. (In actuality, iOS 9 cracked the 20% bar early Friday.) The most important difference between the two editions that led it to its conclusion was the smaller amount of free storage space required to install iOS 9.
While iOS 8 demanded as much as 5GB of open storage space to install the upgrade after downloading it over the air -- forcing those with small storage-sized devices like the 16GB iPhone to turn to the awkward iTunes-based approach -- Apple has promised that iOS 9 requires less than 2GB of free space.
iOS 9 can be downloaded over the air from iPhones, iPads, and iPod Touches, or through iTunes. From an iPhone, for instance, users must tap the "Settings" icon, then the "General" button on the resulting screen. Tapping "Software Update" will kick off the process.
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