That's what you had to do to use Amazon's app store within an app as well: > Instead, the first time a user tried to download an app, they were prompted to “en

That's what you had to do to use Amazon's app store within an app as well: > Instead, the first time a user tried to download an app, they were prompted to “enable downloads” if they haven’t already adjusted their Android phone’s security settings to enable downloads from outside of Google Play. Amazon’s app also walked users through these steps making the entire process very simple. So if you want to use Amazon's app store, either before or now you'd have to turn on "Unknown sources" for app installs. This doesn't change that.