Download the OS X Lion installer from another Mac's App Store using your Apple ID. Once you downloaded the installer you can create a bootable flash drive using /Applications/Install OS X Lion.app. Ars Technica has an in-depth guide on how to do that: How to create a bootable, backup Mountain Lion install disk.

Instructions for creating a bootable disc for Mac OS X 10.6: Please Note: Burning a DVD of this image requires a Dual Layer DVD capable computer. • Boot your computer into OS X • Go to Applications->Utilities • Double-click on 'Disk Utility' • Select 'Burn' from the 'Images' menu • In the 'Open' dialogue which appears, select one of the images you'd like to burn to CD or DVD. • You will then be prompted to insert a blank CD or DVD; do so and the burn process will begin. For alternative installation methods that do not require burning a DVD,. If you are using Bootcamp, you will need, Useful references from Apple.

Pacifist opens up.pkg installer packages,.dmg disk images,.zip,.tar. Tar.gz,.tar.bz2,.pax, and.xar archives and more, and lets you extract or install individual files out of them. This is useful if you need to install just one file out of a package instead of the entire package (for example, if you deleted your Preview application and need to reinstall it, but not the whole operating system), or if you want to inspect a downloaded package to see what it will do before installing it. Pacifist can also load some archive types over HTTP, in case you want to extract just a single file from a large.zip archive without What's New in Pacifist. Pacifist opens up.pkg installer packages,.dmg disk images,.zip,.tar.

Tar.gz,.tar.bz2,.pax, and.xar archives and more, and lets you extract or install individual files out of them. This is useful if you need to install just one file out of a package instead of the entire package (for example, if you deleted your Preview application and need to reinstall it, but not the whole operating system), or if you want to inspect a downloaded package to see what it will do before installing it. Pacifist can also load some archive types over HTTP, in case you want to extract just a single file from a large.zip archive without waiting for the entire archive to download. Finally, Pacifist can examine the kernel extensions installed in your system to let you see what installer installed them, and whether the installer was made by Apple or a third-party.

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