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I don't know why you'd want to. The Starfinder PDF is only $10.
And we don't even have a full SRD online yet. The version created by d20pfsrd.com is incomplete, and the one planned by Paizo is not available yet. Throw in the fact that there will be official updates every couple of months and (for the version maintained by d20pfsrd.com) unofficial updates even more often, and you may as well just go online to look things up directly.