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Downgrading the OS

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I have a macbook that's a few years old.  It was originally running Mac OS X 10.6.3, but after I encountered a strange issue that caused my laptop to freeze constantly, I took it to the Genius Bar and they upgraded the OS to OS X 10.7.5.  It resolved the issue, but when I try to re-install an old piece of software I was running on 10.6.3, it failed, indicating that the newer OS didn't support certain files. 


So now I'd like to downgrade from 10.7.5 back to 10.6.3.  I have an installation disk for the latter, but when I try to run the installation, I get the following error:


"You can't use this version of the application install Mac OS X with this version of Mac OS X.  You have Install Mac OS X 23.1.1."


Can anyone offer any suggestions, or maybe a link where a solution for this has been discussed?  I admit I'm not especially computer savvy, so I'm not always sure what I'm looking for regarding advice.


I'm probably due for a new computer and an upgrade to the software, but until that happens, I'm hoping to be able to re-install and use the old software.

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