I have a MacBook Pro Mid 2015 that won't upgrade to Monterey even with a direct download installer. The hard drive is a APPLE SSD, has over 200GB of free space, firewall disabled, no security software and I have ran first aide on the hard drive with no errors.
Is your Date & Time correct?
What has often worked for others is to use this Restore Method instead of CMD+r keys...
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
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Any other information, i.e., what happens when you've tried?
If I try and force it with the installed it says "This update cannot be installed on this computer" for Macintosh HD with 199 gb of free space. SSD is genuine APPLE SSD SM0512F.
macOS Monterey Upgrade Fail
