If you do, reboot into your El Capitan Mac's recovery partition. If you never dive into any of those folders, you won't notice the difference in day-to-day usage. That's one way to protect important operating system files from external tampering! Not even administrators can add to these folders or edit files that are in them, though they retain their access to the rest of the files on the drive. This list includes /System, /bin, /usr ( but not /usr/local), and /sbin. They will give you a redemption code that you can use to download lion from within the App store.System Integrity Protection, also called "rootless," is a new system security feature that prevents the user or any process from writing in system-protected folders. If for some reason you don't want to upgrade all the way to 10.10 Then if you want to upgrade to 10.7 lion, You have to call 1-80 for education purchasing. But just think, this is the last OS you will need to pay for.at least for right now. It is not available through the App Store. At least this is the "legit" way of doing this :) Apple only has 10.6 available to ship to you on DVD. If you do not already have a DVD copy of 10.6, you will need to purchase 10.6 snow leopard from this link from apple. Then you can access the AppStore and jump to 10.10 Yosemite. Just make sure you install all 10.6 system updates which will stop at 10.6.8. You can not jump from 10.5 to 10.10 for a couple reasons. So, In order to upgrade from 10.5 to the current OS version you have to upgrade to 10.6 first. OS 10.6 is not available in the app store.Mac operating systems were only available on DVD.Back in the day of OS 10.5, there was was no Mac App Store only iOS app store.Unless you have an image system/server in place already, upgrading from OS 10.5 to 10.10 can be a pain. Modified on: Mon, 15 Jun, 2015 at 2:45 PM How to upgrade OS 10.5 Leopard to 10.10 Yosemite
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