Lion and Mountain Lion have different hardware requirements, but the Apple hardware requirements for Mavericks are the same Mountain Lion. Lion requires a minimum of 10.6.6 already be installed, unless you have the USB Flash drive for it, and Mountain Lion and Mavericks requires a minimum of 10.6.8. Note: Mavericks you can update tofor free, whereas both Lion and Mountain Lionyou can not. If you are interested in upgrading to Lion you can read this tip, and Mountain Lion or Mavericks, this tip. Leopard (10.5) is not to be confused with Snow Leopard (10.6) which are different paid operating systems. Using the model name, find the release date of that model on Wikipedia or, and the followup date. To determine the age of a Mac, plug it in the support status search engine, and use the serial number lookup. AppleCare may have those discs if you lost or misplaced it. Note: Macs newer than Apbut older than Jmust use the original 10.6 installer disc that shipped with them to boot 10.6 from CD. Read about updating to 10.7, and this tip about how to optimize your Java in 10.6 if you are stuck with 10.6.ġ0.6 retail is available from the Apple Store on (the /us/ in the link may be changed for the standard two letter country code matching the store link). Backup your data and at least update to 10.6.8 if your Mac says it is Intel in Apple menu -> About this Mac. Java is outdated in terms of security in Mac OS X 10.6. To determine if that repair is necessary, post to the forum, and someone will be able to help you to find out which repairs might be necessary. 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 through Mojave.

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, 10.10 Yosemite, and 10.11 El Capitan to 10.14 Mojave.

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