Updating os x 10 4 11
Mac users running a prior version of OS X can find the latest version available now from the Mac App Store, the App Store represents the easiest way to install the software update.
As always, be sure to start a back up of your Mac and let it complete before starting the software update process.
You do not need the Apple ID for the upgrade itself, but once you upgrade to Snow Leopard, you should update to the newest version which is 10.6.8.
At that point in time you will get the Mac App Store as a new application.
In some cases, the only solution is to restore back to the prior OS X release with Time Machine, perhaps while a few remaining bugs or quirks are worked out.Apple has released OS X 10.11.4 for Mac users running El Capitan.The new version supports Live Photos in Messages app, password protected Notes, and includes compatibility support for i OS devices running i OS 9.3.As far as the upgrade is concerned, it's quite seamless.You buy the disc, plug it in and it will ask you if you want to upgrade, you say yes and let it go about its business and it'll reboot and you'll be on Snow Leopard, no fuss no mess..
Some users may encounter a kernel panic on boot or during the update as well.