Mavericks, Yosemite, and El Capitan are available for "free" (older software written for Power PC Macs may require a paid update to become compatible before installing 10.7 or later) download for those with 10.6.8 or later.
Previous operating systems you can find at Used and Refurbished Mac shops.
Tiger-oriented Macs now allow the use of special keys on aluminum Apple Keyboards to control Aperture slideshows, and the update addresses an issue where help content for some applications could display in English when using the computer in another Mac OS X language.
Mac OS X 10.4 Tiger uses less memory than Leopard, supports Classic Mode on Power PC Macs, and, unlike Leopard, is supported on G3 Macs, so there are good reasons to install or reinstall it on your old Macs.
For each disc, its retail CD logo is shown below: Puma (10.1) there is , Jaguar (10.2) there is , Panther (10.3) , Tiger (10.4) , Leopard (10.5) , and Snow Leopard 10.6 . In addition, there are security updates which are not listed in the tables below, though are included with some of these updates. But you can use an internet search engine to search for an update using 'support.DL name of update' and usually get the download link.
Note, 10.6.8 Security Update 2012-001 version 1.1 repairs 1.0's disabling of several Rosetta (Rosetta indicates programs designed for pre-2006 Macs that used the Power PC CPU) applications and drivers.
You may also be able to find Leopard by calling Apple's retail online store phone number, though not from their website directly.
No Mac may run an older operating system than it shipped with (links to the Mac OS X Upgrade FAQ, where at the beginning there are articles which explain why this is the case), and you need to use either the disks which came with the Mac, or newer retail disks to install Puma (10.1), Jaguar (10.2), Panther (10.3), Tiger (10.4), and Leopard (10.5) retail titles.
Note, Jaguar, Panther, Tiger, Leopard, Snow Leopard, Lion, Mountain Lion themselves are only available for purchase.On Power PC machines, Tiger is the last version of OS X that supports Classic mode, the built-in virtualizer for Mac OS 9 applications.Using Classic mode on a Power Mac G3 or better, it is still possible to run many applications compiled for the original 680×0-based Macs as far back as the 1980s. If you still have a link to index-site.com, please update it to Note: Apple in 2012 discontinued the links of apple, apple, and kbnum.Any italicized links below which remain in this format, are because Apple did not inform of their new location before discontinuing the new kbase link.