If Windows Update is taking time to collect updates, the best alternative from the options you've provided is to:
Download a standalone update and perform a manual install.
You can accomplish this by visiting the Microsoft Update Catalog (https://www.catalog.update.microsoft.com/Home.aspx), where you can search for and download specific updates manually. This method allows you to find specific updates you need without waiting for the automatic update process to complete.
The other options are generally not relevant to simply getting updates manually:
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Configure Windows Update service to use a managed account: This is not a typical solution for resolving update delays and is more related to specific configurations in enterprise environments.
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Configure Windows Update service to start in Manual mode: This doesn't address the delay in collecting updates; it only changes how the service is started.
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Order the Feature pack installation media from Microsoft: This option is not practical for general updates and is more relevant for major version upgrades or specific installations.
Downloading standalone updates is the most effective and direct method to access updates if Windows Update is unresponsive.