When I update an existing Windows store app does it add to the previous size of the app?

Question

I want to know what exactly happens when I update an app in windows store.Does the update replace the entire old version of the app with the new one or does it add to the previous size.(Eg: suppose i have an app of size 30MB and i get a notification about an update of size 10MB.so if i update will it download 10MB or will it be replaced entirely by the new version of 30MB or more).A proper logical explanation about how this update thing works will be helpful.

Answer 1

When you create a package for your project, you can see this screenshot:

If you choose generate app bundle always, customers can download faster with an app bundle, because they only download the assets that they need. If you don't generate one, your app will run just fine, but your customers will have to download a larger app.

Based on your description, when you downloaded your app firstly, you may need to download 30 MB, and when you update your app, you just download 10MB.

What’s more, here’s the more detailed information about packaging app.