Proto.io Spaces is a great place to find inspiration and learn from other designers. While you’re browsing through the various projects on Proto.io Spaces, you might find a project you would like to study closer. Make sure you have set your Proto.io Spaces account first.
When you click to preview, just under the preview window, you see the following options: to Share on social media, to import/download, and to mark as ‘favorite’.
When you click on import/download, you’re asked for your target account (if you have more than one accounts) and then you’ll be asked to confirm this action. After a few moments, you’ll see the project in your Projects list.