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Hello,

We haven't considered adding a way for people to own games on itch.io that they already own on Steam. I need to think about it some more but it could be an interesting feature.

You can import a list of email addresses and generate keys from them using the Kickstarter import tool. We support a plain CSV format that includes a list of emails (maybe the tool should be renamed at some point). Once you've imported them you can send out a email to everyone using the email tool. More info here: https://itch.io/updates/improved-buyer-emailing-kickstarterintegration

It would need one layer of security beyond just putting in the AppID number, like if there's a Steamworks call to check that your login credentials match the AppID's administrator.

For now, the Kickstarter Import feature will do (maybe Backer or Community Import?). Gonna be a lot of emails to sift through! Hooray! :/