Before downloading, ensure your Mac meets these minimum specifications:
You can download the official DMG installer directly from the Apple Support Download Page .
Open the "Install Mac OS X Lion" app from your Applications folder and follow the on-screen instructions. Important Compatibility Note
Already running OS X Snow Leopard 10.6.6 or later (10.6.8 recommended). Memory: At least 2GB of RAM . Storage: At least 7GB of available space . How to Install
Open the .pkg file inside the disk image. This will install an app named "Install Mac OS X Lion" into your Applications folder.
Visit the Apple Support page and click the Download button to receive the InstallMacOSX.dmg file. Open the DMG: Double-click the downloaded file to mount it.
Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon.
This installer is with any Mac that originally shipped with Mac OS X Mountain Lion (10.8) or later. If your Mac is running a very old version like Tiger (10.4) or Leopard (10.5), you must first upgrade to Snow Leopard (10.6) before you can install Lion.