If your computer already has Mac OS X installed, Mac OS X Yosemite Installer will just update OS X normally, without deleting any of your apps or files.
It can be the same computer as the one mentioned in the previous point. The computer can run either Windows or Mac OS X both operating systems will work. Interested? Here are the Hackintosh Yosemite requirements: However, Mac OS X Yosemite Installer includes experimental “patched” kernels that may allow Mac OS X to work with these processors regardless. Normally, computers that use AMD processors are unsupported by Mac OS X. Normally, you can bypass this limitation on Unibeast by applying the MBR patch however, Mac OS X Yosemite Installer does this for you automatically, saving you one extra step. Therefore, if your computer’s hard drive already has Windows installed on it, you won’t be able to install Mac OS X on there. By default, the Mac OS X installer will not work with hard drives that were originally formatted in Windows.
