iTunes Music: How to download all your iCloud songs

In this video, I will show you how you can download all the songs of your iTunes music library from iCloud to your local disk with just a few clicks.
Export your favorite playlists and albums from your music library to any external disk or media player with my Export for iTunes Mac app: apps.apple.com...

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What if the songs in the iCloud list are grayed out? (Those are the ones I need.) How do I download them?
Thanks in advance!