MacBooks don't run iOS at all. That is for iPads and iPhones. What version of Mac OS do you have (from About this Macintosh)?
Are you sure CS6 isn't still in Applications?
Unless you actually uninstalled CS6 it will still be on the computer. If you did uninstall it, open the CC Desktop App and go to the Applications tab, the scroll down to Find New Apps and click the filters button to choose Previous Version
Thanks for reply!
Sorry meant OS X - been talking about iOS to someone else! I have OS X 10.6.8
Yes have checked all applications but now only have the updated CC version which will not open.