If you mark a file as a demo it will always be free, regardless of any price you've set on the project. If you had a project page that you're now putting a price on, you can safely upload the paid files, set the price on the project, then select the "This is a demo" checkbox next to the demo file. That file will remain freely available. Tell me if you're still having trouble. Thanks
Viewing post in Offer a demo alongside your purchasable games comments
thanks for the reply!
i'm still confused, because on the Edit Game page, i don't see the word "demo" anywhere. i don't see a checkbox labeled "This is a demo" or an option for "This file is a demo and can be downloaded for free". has this feature changed since you posted this info?
as a result, i'm still having trouble, although the solution might be right in front of me simply labeled differently.