As an alternative to prompting a user to close an app before it updates, being able to prompt a user to restart an app once it has finished updating may be of use.
Example from Tidio:
When Chrome installs an update, it doesn't fully update until Chrome is restarted. This can cause reporting tools to show Chrome as still requiring an update. Rather than prompt a user to close Chrome pre update, Prompt them to restart Chrome post update.
Related: auto restart running apps that were closed as a conflicting process
+1