If you're looking to Download Open App on your Chromebook laptop Then read the following guideline.

Get quick and easy access to your favorite apps right from the lock screen! When you first launch an app from the lock screen,  we'll ask for permissions,  but after that, it's a simple click of an icon! With over 200 apps available,  you don't need to know any URL Schemes to launch apps directly from the lock screen. If there's an app you'd like us to add, just let us know through a review,  and we'll make sure to add it in no time. Your convenience is our priority!