I&#x27;m pretty sure you have to keep the checkbox unticked so that the Amazon app can install apks and even update itself. In fact Amazon&#x27;s official documentation[1] for installing their app doesn&#x27;t tell users to uncheck the checkbox. The way I see it, keeping the untrusted apks checkbox ticked is a massive security risk.<p>[1] <a href="https:&#x2F;&#x2F;www.amazon.com&#x2F;underground" rel="nofollow">https:&#x2F;&#x2F;www.amazon.com&#x2F;underground</a>