i have a 2011 iMac 27 inch and i like El capitan and had no intention to upgrade but it appears that now that i updated itunes to the latest version that was just released 2 days ago i can now no longer sync my iPhone X to with the iMac as a message pops up prompting me to update the operation system on the iMac. is there no way for me to sync anymore unless i update the system on the iMac?