Trouble Installing from Install Disc on old iMac

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A friend gave me an old Mac desktop after erasing the hard drive, no serial information. The accompanying install disc is OS 10.6 Snow Leopard, so I’m guessing its from 2009.

The problem I’m running into is that installing OS 10.6 requires 499.25 GB of space, but only 498.8 GB are available, because 447.3 MB are in use. Applecare no longer supports this model because its obsolete and I have zero tech skills.

Any ideas if this is solvable?

Thanks

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