OS X Yosemite Install Disk

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There are a couple of ways to downgrade, the first being through Internet Recovery Mode, or by using an ISO of the Yosemite Installation Disc.

1) Internet Recovery Mode - Internet Recovery Mode is basically the Web-based version of the Recovery partition that is on your Mac, however it defaults to the recovery partition your mac came with. To do this, you need to restart the Mac, and then as it starts up you need to hold down a combination of Command (⌘) – Option (⌥) – R immediately upon hearing the startup chime. Your then be prompted to select your WiFi Network (or it will default to Ethernet if it's connected via Ethernet), and then it will appear with Recovery options. From there you will need to erase the hard drive (see below) and then will need to select 'Reinstall Mac OSX'.

The catch about Internet Recovery Mode is that:

You first need to erase your Hard-Drive through Disc Utility. The best way I can recommend to do this is to beforehand backup your device through Time Machine to an external drive, and then erase the hard drive through Internet Recovery Mode via Disk manager. That way you can restore your Files & Applications once you have finished Internet Recovery Mode.
By doing Internet Recovery Mode it restores the Device to the original OSX Version. So if your device came with Yosemite, then it will restore to Yosemite.
It uses up a bit of Internet..... If you on Cap'd Internet then I wouldn't recommend it (it uses something like 12-15gb).

The problem I have found in the past is that through Internet Recovery mode, if you wish to upgrade you can only upgrade to the latest version of OSX. So if Internet recovery Mode reinstalls OSX to Lion, if you want to upgrade to Yosemite you have to have previously downloaded the Yosemite Upgrade File (which you can find in ‘Purchased’ in App Store) and run that, otherwise your only able to download the latest (Sierra).

2) Yosemite Installation Disc - As you have previously mentioned, you don't have a Yosemite Installation Disc. However, I do have one that I keep as an ISO file on Google Drive and can post the link if you want. This method won't use as much Internet as Internet Recovery Mode as obviously, your Mac will only be downloading the ISO file, not the Recovery Mode Setup Files. This ISO File, you will need to extract and burn onto a Flash Drive (at least 8gb formatted as MacOS Extended Journaled) or a CD/DVD. To burn it as an ISO just have a google online to find out how to, depending on the method it’s complicated to explain on here.

Again, like Internet Recovery Mode, you will need to erase your hard drive again. The best way I can recommend to do this is to beforehand backup your device through Time Machine, and then erase the hard drive through Recovery Mode via Disk Utility. That way you can restore your Files & Applications once you have finished. Once you have done that your need to plug in your USB Device/DVD/CD and then it should automatically boot up to it after you restart the Mac. If not follow the steps at https://goo.gl/fFujKO to find out how to manually do it. Follow the prompts, and then once its done restore your data by using the Time Machine Option in Migration Assistant.

Let me know how it turns out, and if you want that link posted :D

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