Scott has an iMac and MacBook Air and he is concerned about upgrading to El Capitan because it may break some of the software he uses. Leo says he should always upgrade to the latest. The upgrade is really easy to do and it doesn't break many utilities. He could roll back if there is an issue, but Leo says he probably won't have to. Some really old software may have issues, but that's only if the software is reliant on the old Rosetta interface, which Apple killed a long time ago. So anything written in the last few years won't be an issue.