Will Download Resume After Closing My App in Background Mode

NSURLSessionDownloadTask resumes automatically all task while in background

If you absolutely need to run these requests sequentially, I would suggest not instantiating all of these tasks up front, but rather instantiate them one at a time, only instantiating the next one upon the completion of the prior one.

But we must recognize that you pay a significant performance penalty for running the requests sequentially. (And this problem will be magnified when using background sessions.) If at all possible, see if you can change your requests to run concurrently. Clearly, if you need the output of one in order to create the request for another, you're stuck (or at least until your refactor the server code), but that's clearly not the issue here (because you created all of the requests up front). If you're doing this sequential request process for artificial reasons (e.g., the code is populating an array and you want that in order), then you might want to redesign the implementation to remove this artificial constraint.

iOS Newsstand download failed when shut down the app

You need to resume your downloads when the App Launches again.

Something to the tune of this would work

// Inside App Delegate Did Finish Launching
NKLibrary *nkLib = [NKLibrary sharedLibrary];

for(NKAssetDownload *asset in [nkLib downloadingAssets]){
    [asset downloadWithDelegate:newsstandDownloadDelegate];
}

If you read the documentation you will find the following paragraph detailing how you should handle app termination:

While assets are being downloaded, the application could be suspended
or even terminated entirely if, for instance, there is insufficient
memory or the user force-quits the application. The application
(assuming it has the newsstand-content property) is later relaunched
into the background to handle the completion of the download or any
authentication challenges or errors related to it. The procedure in
this case is the following:

When the application is launched, it can use the
UIApplicationLaunchOptionsNewsstandDownloadsKey key to access an array
in the launchOptions dictionary passed into the
application:didFinishLaunchingWithOptions:. If there is an array, it
contains the identifiers that caused the launch; these could be
identifiers for downloads that have finished downloading that or could
not complete downloading. It iterates through the array of
NKAssetDownload objects from the downloadingAssets property of the
NKLibrary object and calls downloadWithDelegate: on each of them. If
it wants, the application can use the asset identifiers obtained in
the previous step to check which asset downloads caused the relaunch.
The NSURLConnectionDownloadDelegate object handles the asset downloads
as it does normally. The Newsstand Kit framework expects all calls of
its methods to be made on the main thread; the NSURLConnectionDelegate
Protocol methods are also invoked on the main thread.

How to keep UWP app data refreshed in background without having UWP app opened?

In UWP apps you can use BackgroundTasks to keep your app data refreshed even when the app is not actively running in the foreground.

https://learn.microsoft.com/en-us/windows/uwp/launch-resume/support-your-app-with-background-tasks

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