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When you get to the El Capitan page in the App Store, click on the Download button. And you can always do a search on El Capitan. Apple will probably have a banner at the top promoting El Capitan, but if you don’t see one, you can probably find it in the Free section in the far right column (you might have to scroll down to see it). You’ll probably find El Capitan right away, especially if go to the App Store soon after the official release.

To download El Capitan, launch the App Store app in your Applications folder (or go to Apple menu > App Store). Or you can use your Mac while you wait, but be ready to save your work and quit when the download is done. The download is a bit over 6GB, so you may want to download it at a time when you have other things to do-how long the download takes depends on your Internet connection and the amount of activity at the App Store. I see too many folks with problems from using BootCamp.Apple provides the El Capitan upgrade through its App Store. Unless you really need native Windows bootability on the Mac, you might do better to use "an emulation solution" such as VMWare Fusion, Parallels, or the free "Virtual Box". I understand that it can be done, but that it's more complicated than doing so onto an internal drive. I'm not a windows user, can't help with the fine points of installing windows onto an external drive. What's important is that the external drive have a good copy of the Mac OS on it. The Mac doesn't care about WHERE it boots from. You should now boot to the external drive.Īn important thing to remember re the Mac v. Select the external drive with the pointer and hit return.

Hold down the option key immediately and keep holding it downĤ. Power down and reboot (or try a restart)Ģ.

When done, you can boot to the external drive by doing this:ġ.

You can try running the installer and "pointing it" at the external drive.īut first - you must open Disk Utility and erase the drive to HFS+ with journaling enabled. This should download a copy of the installer to your current (internal) drive. In fact, I'm typing this on a Mac that I normally boot and run from an external SSD.ĭo you have a copy of the El Cap installer already? It's easy enough to install El Cap (or any version of OS X) onto an external drive.