Delivery Optimization in Windows clears its cache automatically. Files are removed from the cache after a short time period or when its contents take up too much disk space. However, if you need more disk space on your PC, you can manually clear the cache.
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In the Search box on the taskbar, enter disk cleanup. Select the Disk Cleanup app from the list of results.
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On the Disk Cleanup tab, select the Delivery Optimization Files check box.
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Select OK. On the dialog that appears, select Delete Files.