Trying to upgrade from 10.2 to 10.3

Posted:
in macOS edited January 2014
I'm having a hard time getting my laptop to upgrade from 10.2 to 10.3, I'm using my Dad's DVD that came with his new iMac. We just both bought iSight cams, and I can't use the video software without either buying the new software or upgrading.

How do I go about upgrading from a DVD start up disc?

Thanks.

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