If you do not find this file you will have to download it again. Under this directory you will find Installed ESD.dmg file. Right click on this file and choose ‘show Package Contents’ which will direct you to the ‘Shared Support’ directory. Look for the Lion Install ESD.dmg file– Once downloading of the Lion OS is complete, navigate the cursor to the Applications folder and search for the Install Mac OS Lion.app.Get familiar with the following steps and install Mac OS X 10.7 Lion successfully. Mac OS X 10.7 Lion downloaded from the Mac App Store.This will help you to recover and reinstall the operating system in case a system crashes or if there is any other event of misfortune. However, one can create a bootable Mac OS X 10.7 Lion USB flash drives and install them successfully by having some moderate knowledge about Mac. Currently the Mac OS X 10.7 Lion is only available to download for Mac App Store. You can create your own Bootable USB or DVD for Mac OS X 10.7 Lion.