Can't Update to the macOS 15.4 RC? Here's Why
Some Mac users who have an M4 MacBook Air or M4 Max/M3 Ultra Mac Studio are unable to update to the latest macOS 15.4 beta that came out today, according to complaints on Reddit.
Multiple people have reported that attempting to download and install the macOS 15.4 release candidate results in an error message. "macOS could not be downloaded. Make sure you're connected to the internet and try again, or contact Apple support for assistance," reads the error.
It turns out that Apple failed to provide the appropriate decryption key for the M4 MacBook Air and Mac Studio models to install the update. Apple encrypts its software updates and a server-side decryption key is required for installation. The key for new Macs is not available from Apple's software server at this time.
If you have one of the new Macs that's running the software that it came with when it arrived, you won't be able to update to the macOS Sequoia 15.4 release candidate until Apple fixes the issue.
This problem will not affect new MacBook Air and Mac Studio models that were previously running macOS 15.4 beta 4, as these machines can install the release candidate.
Popular Stories
Update 10:04 a.m.: iOS 27 is rolling out now, though it may take a bit for all users to see it, so keep checking!
Apple is about to release iOS 27, which will finally deliver more advanced Siri AI capabilities as well as a variety of other refinements, improvements, and new features to iPhones. It's Apple's biggest software update of the year, and Apple announced at Wednesday's iPhone event...
Update — 10 a.m. Pacific Time: Apple has released iOS 27.
During its iPhone 18 Pro and iPhone Duo event last week, Apple announced that iOS 27 will be released widely on Monday, September 14.
iOS 27 should be available around 10 a.m. Pacific Time / 1 p.m. Eastern Time today via the Settings app, under General → Software Update.
Below, we have highlighted eight new features and...
Apple today announced a new subscription initiative that turns paid iCloud+ subscriptions into a broader services bundle in more than 100 countries.
In select countries, Apple says every paid iCloud+ plan, including the cheapest 50GB tier, now includes Apple TV and Apple Arcade "at no additional cost," while family sharing extends the storage, TV and Arcade access to up to five people....
