can't upgrade from my iMac Pro retina 5K 27" late 2015 to MacOS Monterey -apple says its compatible
I have iMac Pro - iMac retina 5K 27" late 2015 Big Sur- macOS Big Sur Version 11.2.3. 8 GB installed 899.17 gb available of 1.02TB
Want to upgrade to MacOS Monterey 12.7 - 12.4 GB
Tried several times and it will not upgrade.
Plese help
iPhone 5c, iOS 10