[tzs]

That should be read as "when the application is (downloaded and launched)".

If it were meant as "when the application is downloaded and every time the application is launched" it would probably have been written as "when the application is downloaded or launched".

Also, there would be no point in mentioning downloads if that was a separate check because the app developer cannot request the signal upon download because their app is not running then.

The most reasonable conclusion is that the app must check the first time it is launched.