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Proton is a browser-based platform that allows users to access a wide range of services, including email, messaging, social media, and more. It is not an app that you can download on a traditional device like a smartphone or computer. Instead, Proton is a web-based service that runs in the browser. If you are referring to a specific Proton app, please provide more details so I can assist you better. For example, are you looking for an email service, social media app, or something else?