In the most recent version that box doesn't exist any more. Instead you can grant a particular app the permission to install unknown apps (in Settings > Apps > Advanced > Special App Access > Install Unknown Apps) rather than a global setting which allows any app able to launch the app installer to do this.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.