A: Mostly yes. However, some new features of iCloud Drive and Safari may not be fully compatible. Standard Apple ID login, Mail, Contacts, and Calendar work seamlessly.
In rare cases, Apple’s download link may redirect to a blank page or fail to initiate the download (especially outside the US). While we strongly recommend the official method first, here are vetted, clean mirrors for the . mac os x el capitan 10116 installer dmg download fixed