Yes. Lots of different ways. You can use the Distribute tab to generate Download keys and mail them out manually. Or use the Patreon system to grant access automatically through Patreon.
Or, probably the closest to what you want: use the Kickstarter import tool (pictured below) to do all the emailing and stuff for you. No actual Kickstarter required.
Do note that you have to email support to get the emails to actually go out (presumably for anti-spam measures).
You just need a little CSV file in this format. Each email address can have a different contribution level too, if you desire. That is, alice@example.org,$10.00 would get the download files as if they had spent $10, whereas betty@example.org,$20.00 would get the fancy $20 rewards. Neither of them actually get charged anything.
