Finally, you may need to use the Startup Manager to boot the operating system when the 'C' key doesn't work in order to get the installer to work or repair the disk before installation if the initial attempt to install fails.
Read the info below to ensure you are compatible. Shut down, and disconnect any peripherals before continuing with the installation. I would not downgrade to Leopard without erasing your data first.īe sure to backup your data first at least twice before installing any operating system. When determining your Mac model, see this tip to find its age: Server versions of Mac OS X may have different limitations, and the people visiting the appropriate Server forum may be able to answer your questions better about Mac OS X Server. Note this tip, and the series of tips from 10.2 (10.2, and 10.3 not mentioned in above links as people must have 10.4.4 or later on an Intel Mac to get to 10.6) to 10.11 I've written here all refer to Mac OS X Client.
A few Macs which came with 10.6 can install Sierra. Mac OS X Sierra was released on September 20, 2016. Tips on 10.4 Tiger, 10.5 Leopard(last compatible operating system for G4 867 and above, and G5s), 10.6 Snow Leopard ( end of the line for PowerPC applications), 10.7 Lion, 10.8 Mountain Lion, 10.9 Mavericks,ġ0.10 Yosemite, and 10.11 El Capitan to 10.14 Mojave.
