I accidentally deleted AddressBook.framework. Now when I restart my iMac the system can't load this framework thus nothing is working.
I have a bootable disk of macOS Sierra but going to recovery mode and installing macOS Sierra is not possible because downgrading High Sierra isn't allowed.
Formatting my disk will result in losing all my files because I don't have a Time Machine backup.
How can I restore AddressBook.framework to get my system working again.