Updated iTunes in 10.12.6 from 12.6.2 to 12.7 Booted from another volume, deleted 12.7, booted back and installed 12.6.2 All ok. Then updated to 10.13, then got error 45076
iTunes 12.6.2 is installed by default with 10.13, in a fresh installation of 10.13: iTunes 12.6.2 -> no error
This is right 👌 Downgrade To iTunes 12.6.2
1.turn off 「 MAC SIP 」
2.Mac restart
3.terminal code - need Add 「 sudo 」 Frist
sudo rm -rf /Library/Documentation/Applications/iTunes/Acknowledgements.rtf /Library/Documentation/iPod/Acknowledgements.rtf /Library/Frameworks/iTunesLibrary.framework/ /Applications/iTunes.app/ /System/Library/PrivateFrameworks/iTunesAccess.framework/ /System/Library/LaunchDaemons/com.apple.fpsd.plist /System/Library/PrivateFrameworks/CoreFP.framework/ /System/Library/PrivateFrameworks/CoreADI.framework/ /System/Library/LaunchDaemons/com.apple.adid.plist /System/Library/CoreServices/UAUPlugins/ADIUserAccountUpdater.bundle/ /System/Library/CoreServices/CoreTypes.bundle/Contents/Library/MobileDevices.bundle/ /System/Library/LaunchDaemons/com.apple.usbmuxd.plist /System/Library/PrivateFrameworks/AirTrafficHost.framework/ /System/Library/PrivateFrameworks/DeviceLink.framework/ /System/Library/PrivateFrameworks/MobileDevice.framework/ /System/Library/Extensions/AppleMobileDevice.kext/ /System/Library/Extensions/AppleUsbEthernetHost
4.install iTunes 12.6.2 & restore Your backup file 「 iTunes Library.itl 」
5.turn on 「 MAC SIP 」
6.Disable iTunes update - terminal code
sudo softwareupdate --ignore iTunesXPatch
ps:
https://apple.stackexchange.com/questions/299842/how-to-fix-itunes-error-45076