How can I install 10.7.1 (new update) or roll back to 10.7.0 from 10.7.2 for developer without Time Machine

Hello,
After upgrading to 10.7.0, I got problem with 5.1 digital out sound on my MBP Early 2011.
Then, I decided to upgrade to 10.7.2 for developer to make the sound working again.
But what a pity, the 5.1 digital out sound did not work either.
Now, Apply release an update 10.7.1 for MBP.
I did download 10.7.1 to my computer but it was not be able to upgrade.
Could you please help me how to install 10.7.1 over 10.7.2 or return to 10.7.0 then I will upgrade my MBP to 10.7.1?
Please note that I don't have any backup or TimeMachine active on my MBP.
Please do not tell me to format my HDD because there are a lot of files that I am working on them.
Thank you very much in advance!

here is my solution https://discussions.apple.com/message/16220049#16220049 gl.

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