MicroSoft, nor any PC manufacturer, provides Windows or Windows upgrades for free.

So why should Apple?

That was the rationalle behind Apple's decision to stop providing free upgrades to the OS. And that was when OS 7 came out (In the late 80's? Early 90's?).

I know. I was the President of the local Macintosh Users Group at the time.

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So that leads me back to the my question: Why are you looking for it? Don't you have the original DVD that came with the computer?