In terms postapokalipsisa you have only one way to survive, this is an exception to any rules. Create your own killing machine, able to withstand any collision and harsh sands. How much you will be able to hold out among the same crazy drivers in the pursuit of profit?
To update the application, install the new version of the application over (without deleting) the old one.
This update will only be possible if the previous version of the application is downloaded from us. Otherwise, there will be a signature conflict and you will see the message "Application not installed".
For what "Signatures" are and what they are for, read here.