I have spoken to Apple's phone service, who told me that my computer is too old to run macOS High Sierra (their latest) and suggested I upgrade to OS X El Capitan (the previous version) which they assure me will run iCloud. The problem is I wish to test run the iCloud to familiarise myself with these programmes as I feel their layouts will be very different given the time difference, but I need to continue working with my familiar CS4 programmes and Quark while I re-teach myself. I wish to bring myself up to speed with the current versions of Photoshop, Illustrator, InDesign and Acrobat. I am a publisher currently running Mac OS X 10.6.8, using Adobe Creative Suite CS4 and QuarkXPress 8.5.1.