Click on the "Archive" button within the K4Mac app, then either double-click on each and every book you want redownloaded, or right-click/choose the option to re-download whose exact phrasing I have forgotten.
Unfortunately, there is no way to batch re-download. Although you could probably speed the process up slightly by going to the Manage Your Kindle page on Amazon and pick Send To [K4Mac device name] for each and every book again.
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