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Message: <blockquote data-quote="harryb2448" data-source="post: 1762510" data-attributes="member: 42497">1.  To install Leopard OS X.5 you will need a system install DVD.2.  Personally I would give Lion a miss.3.  Depending on the colour of the used Snow Leopard DVD.  A silver/grey original system DVD will work only with bthe model it was released with.  If white with the Snwo Leopard on, boot from that, format the drive and install.  Update to OS X.6.8 and from there use the App Store and your App Store Account to download El Capitan, OS X.11, the latest operating system that will run on your MBA.  You do not need to purchase a license.4.  If Optio0n 3 does not work, then yes use the new OS X.6 DVD.  Again if it is the white disk only.</blockquote>