I know that I can not upgrade a Play Store App without having the Keystore: I read various discussions about it like this, this and more.
My question are:
1) What are the steps to do to add a new application with Different Package name but with the Same Name of the App?
2) When I create a new application with the same Title and try to save it I get an error "This title is already old.package.example". If I un-publish the old App I still get this error?
3) What should I do to have the app offline for less time as possible?
Thank's all for support.