Pretty much any application that customizes macOS can’t run in a sandbox, which is why you’ll have to look elsewhere for tools like Dropbox, which by definition need to work outside the sandbox in order to function properly. First: apps from the Store are sandboxed, which is great for security, but limits what applications can do. Still, you probably won’t install all of your software this way, because the App Store doesn’t have all the applications you want. RELATED: Why the Mac App Store Doesn't Have the Applications You Want Updates are all handled by the store, which is convenient, and any application you purchase on one Mac will work on another. Your application will download and show up in your “Applications” folder. Open the store, search for the app you want, and click “Get” then “Download.” Still, the Mac App Store is a decent first place to check. We’re all used to app stores on our phones, but on the desktop they remain an oddity. Mac App Store: Click a Button to Install an App