![]() ![]() If you have a Mac with a PowerPC processor, Yosemite won't work on it. If you depend on the Classic environment to run Mac OS 9 programs from the 1990s, stick with OS X 10.4.You could install VirtualBox (free) on your Mac, and install 10.6 into a virtual machine, and update it to 10.6.8a,Īnd run your PowerPC programs under the emulated OS. Stick with OS X 10.6.8a until you upgrade these applications. In particular, pre-Lion Quicken, Microsoft Office 2004, and some features of Adobe CS3 will not run on Yosemite. See the Frequently Asked Questions section about Yosemite. Since Lion, Mountain Lion, Mavericks, and Yosemite do not support Rosetta, the PowerPC emulator. ![]() If you depend on PowerPC programs, the latest version of OS X that you can run is Snow Leopard, You need at least 2GB of memory, preferably more.If your computer does not meet these requirements, stick with OS X 10.6 (Snow Leopard), 10.7 (Lion), 10.8 (Mountain Lion), or 10.9 (Mavericks). ![]() See the list online at the Apple web site that specifies what Mac models can run Yosemite. Mavericks and Yosemite also require fairly recent video cards. If you have a Mac that can't boot and run with 64-bit addressing, Yosemite won't work on it. If your Mac can run Mountain Lion, it can run Yosemite. You can buy an installer disc for Snow Leopard from Apple's web site for $20. If you are running a version of Mac OS X earlier than Snow Leopard, you will have to install Snow Leopard first.
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