Installing an app which requires Microsoft Login without logging in

[Spartan (superspartan300)]

I tried UniGetUI to solve one issue but either I am doing something wrong or please add this feature.
For example, let's say I am on a client's computer and they want an app that requires you to log in to the store before you can install it. I thought that if I downloaded the Microsoft Store installer, which is about 1MB in size, it would install the app, but it still asks me to log in first.

Is there a way using UniGetUI to install any app using that Microsoft Store installer? All I was able to find is to search for apps but I can't find the apps that I want like Telegram, WhatsApp, etc.