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
Mac OS X El Capitan from here, Upgrade to OS X El Capitan - Apple Support
Download Mac Os X 10.10
Download Mac OS X Yosemite - The OS X Yosemite 10.10.5 update improves the stability, compatibility, and security of your Mac, and is recommended for all users. 7/10 (266 votes) - Download macOS El Capitan Mac Free. The twelfth version of Mac OS X appeared in 2015. MacOS El Capitan is the successor to Yosemite with improvements to its functions and graphical performance. MacOS is the current name of the former OS X, previously known as Mac OS X. Install older OS X onto an external drive. The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. Start your Mac holding down Command + R. Prepare a clean external drive (at least 10 GB of storage). Within OS X Utilities, choose Reinstall OS X. Select external drive as a source. Enter your Apple ID. HoRNDIS (pronounce: “horrendous”) is a driver for Mac OS X that allows you to use your Android phone's native USB tethering mode to get Internet access. It is known to work with Mac OS X versions 10.6.8 (Snow Leopard) through 10.14 (Mojave – see notes below ), and has been tested on a wide variety of phones.
Mac Os X 10.10 Download Free
As both of these operating systems are a few upgrades newer than Mountain Lion you will need to prepare yourself.
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.
Jul 15, 2017 5:07 AM