This is the full version of OS X Lion released August 2011

System Requirement:
-)--- x86-64 CPU (Macs with an Intel Core 2 Duo, Intel Core i3, Intel Core i5, Intel Core i7, or Xeon processor.)[10][16]
-)--- Mac OS X 10.6.6 or later (Mac OS X 10.6.8 is recommended)[17]
-)--- At least 2GB of RAM[17]
-)--- 7 GB of free hard drive space is recommended[17]
-)--- AirDrop is supported on the following Mac models:[17] MacBook Pro (late 2008 or newer), MacBook Air (late 2010 or newer), MacBook (late 2008 or newer), iMac (early 2009 or newer), Mac mini (mid 2010 or newer), Mac Pro (early 2009 with AirPort Extreme card and mid 2010 or newer).

Updated:
1) Right click the file, and select Show Package Contents
2) Navigate to Contents -> SharedSupport
3) Open InstallESD.dmg
4) Open the Lion installer

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