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.
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 Mac OS X Lion 10.7.5 Free Download
Open the "Install Mac OS X Lion" app from your Applications folder and follow the on-screen instructions. Important Compatibility Note Visit the Apple Support page and click the
Before downloading, ensure your Mac meets these minimum specifications: Memory: At least 2GB of RAM
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.
Open the .pkg file inside the disk image. This will install an app named "Install Mac OS X Lion" into your Applications folder.
Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon.