You need to give us a whole lot more information in order to help you.
First, did you read the step=by-step walkthrough? If not, do that: https://wyday.com/wybuild/help/walkthrough.php
Next, are you creating separate folders on your computer for the different versions of your app? If not, read the walkthrough.
Next, are you getting warnings when you build your updates? If so, treat them like errors. Read them, understand them, and fix them.