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Step 1
Purchase the Macintosh OS X Leopard software program. It should be available at any computer store that sells Macintosh equipment or can be bought at Apple's online store.
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Step 2
Read all the instructions provided before beginning the upgrade. Any mistakes in an operating system upgrade could damage the computer.
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Step 3
Make sure your computer has enough memory and hard disk space for the upgrade. Older models may not have enough available, requiring a RAM or ROM upgrade or a new computer altogether.
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Step 4
Install OS X Leopard using the software provided. Leopard should replace your old Mac operating system, making all its new features available.
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Step 1
Check the purchase date of the computer. If it was purchased on or after October 1, 2007 without Leopard, Macintosh will upgrade it.
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Step 2
Go to Apple's website. Look up their up-to-date program.
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Step 3
Follow the instructions on how to download the Leopard upgrade. This may vary depending on if you bought your computer retail or through the online store.








