IOS Development downloading app before making it public

Hello i want to know if i can download my app before making it public some how after apple's approval process. I've already submitted my app (it's an update) and now i'm waiting for review. Is there anyway testing it before making it public?

Iphone app does not update automatically when you rename it in the iTunes

When I rename an already uploaded app in iTunes Connect, the update is ok, but people who have already donloaded this app before don´t receive any update. Can I make any change in my second upload to avoid this?