Some M4 Mac users, particularly those with the M4 MacBook Air and Mac Studio models equipped with M4 Max or M3 Ultra chips, have reported being unable to upgrade to Apple’s latest macOS 15.4 RC. When attempting to download and install the update, they receive an error message:
"macOS could not be downloaded. Please ensure you are connected to the internet and try again, or contact Apple Support for assistance."
Cause Analysis
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Missing Decryption Key: Apple encrypts software updates, requiring a server-provided decryption key during installation. However, Apple's software servers have not yet provided the necessary decryption keys for these new Mac models, preventing the update from proceeding.
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Limited Scope of Impact: This issue specifically affects new MacBook Air and Mac Studio models that came pre-installed with macOS 15.3 or earlier. Devices already running macOS 15.4 beta 4 are unaffected and can install the update normally.
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Shop NowPossible Solutions
At this time, there is no direct fix for the issue, but affected users can try the following:
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Check Network Connection: Ensure that your Mac is properly connected to the internet, as updates require downloading new system files.
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Contact Apple Support: If the issue persists, reach out to Apple Support for further assistance.
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Wait for an Update: Apple is likely to address this issue in a future software update, so users can choose to wait for an official fix.
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Possible Solutions
At this time, there is no direct fix for the issue, but affected users can try the following:
-
Check Network Connection: Ensure that your Mac is properly connected to the internet, as updates require downloading new system files.
-
Contact Apple Support: If the issue persists, reach out to Apple Support for further assistance.
-
Wait for an Update: Apple is likely to address this issue in a future software update, so users can choose to wait for an official fix.
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Conclusion
The inability of M4 Mac users to upgrade to macOS 15.4 RC is primarily due to Apple’s software servers not yet providing the necessary decryption keys for newer Mac models. Users can troubleshoot by checking their internet connection, contacting Apple Support, or waiting for an official update.
