I'm currently on 10.9. I waited a little too long to download Yosemite and now Apple doesn't have it on the App Store. Know of a safe place to download Yosemite? Why I want Yosemite and not El Capitan: I've already gotten notifications that "Starting with OS X 10.11, Apple has restricted kernel level mixing access for third party vendors." Which means, 10.10 is the end of the line for some of my music hardware and software. I got burned upgrading OS X 1-4 too soon, so I usually stay one operating system behind to make sure I have something stable.