把Lion安裝在Leopard - MAC

http://mac4twn.blogspot.com/2011/07/lion-lionleopard-os-105.html

過了很久因為有些軟體不能用終於決定要升級lion

可是照網址裡改plist為10.6.7時

會顯示權限不足
You do not have sufficient privileges to perform this operation
(MacOS error code:-5000)

請問一下要怎麼解決啊= =

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