I've had so much trouble with Apple updates in the last couple years. I ended up stopping doing upgrades, completely. I'm still on Mavericks and iOS 7 and will remain here until these machines fall to pieces, at which point I'm just going to order something cheap on Alibaba and stick Linux on it. The whole point of buying these overpriced products is that they're supposed to "Just work." They just don't live up to the promise, anymore. Apple is looking more like Microsoft each day.