While you’re waiting for OS X Yosemite to download, go update Instagram as it now brings support for the higher resolution screens on the iPhone 6 and iPhone 6 Plus.
What’s New in Version 6.1.3
Updated for iPhone 6 and iPhone 6 Plus
The update is still propagating around App Stores worldwide, but the Canadian iTunes link shows the latest description.
Click here to download Instagram for iOS—it’s free.