Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon.
Before downloading, ensure your Mac meets these minimum specifications: Mac OS X Lion 10.7.5 Free Download
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. Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon
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 Already running OS X Snow Leopard 10
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.