Yosemite is only available for people who had downloaded it previously, otherwise it is no longer available.
You could probably upgrade to macOS Sierra if your Mac qualifies, otherwise you will be able to update to
The Mac must reboot to complete installation of OS X 10.11.5. OS X 10.11.5 Combo Updates. Mac users can also choose to download and install OS X 10.11.5 by using a Combo Update, or the standard update. This offers a way of updating OS X on a Mac without using the Mac App Store. Mar 21, 2016 The OS X El Capitan 10.11.4 update improves the stability, compatibility, and security of your Mac, and is recommended for all OS X El Capitan users. This update:. Adds the ability to passcode-protect notes containing personal data in Notes. Adds the ability to sort notes alphabetically, by date created, or date modified in Notes. Adds.
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Mac OS X El Capitan from here, Upgrade to OS X El Capitan - Apple Support
As both of these operating systems are a few upgrades newer than Mountain Lion you will need to prepare yourself.
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Make sure you have enough RAM, 4GBs is minimum. Make sure third party apps you use now are supported under El Capitan or Sierra and have updates available, https://roaringapps.com/apps?platform=osx. Also make sure that any peripherals such as printers, scanners etc are supported under El Capitan and Sierra check with the manufacturers of these items for updated drivers / software etc.
iPhoto and Aperture if you had it are no longer supported by Apple in favour of their new Photos app.
How Can I Download Os X 10.11
Jul 15, 2017 5:07 AM