Windows Blogs:
For Win32 apps that are “provided and updated” by their publishers, the Microsoft Store will now support updating directly in the Store. Previously, these apps could only be updated outside of the Microsoft Store. Insiders can head to the Downloads page and click Get Updates. If any installed apps of this type have updates, it’ll be displayed on the pending list. You can perform the update by clicking the update button; it won’t start automatically.

Downloads page with update buttons for Win32 apps installed from the Store.
You can also head to the product page and see an update button.

Update button on a Win32 app product page.
Windows Insiders across all channels running Microsoft Store version 22411.1401.x.x and higher will see this improvement.
Click here to read more about recent updates to the Microsoft Store!
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Source:

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