I assume you are referring to images your community team had uploaded to Studio -> Community Style -> Asset Library (from the dropdown selection) -> Other Assets.
You can download the original image asset from the file name link on the very left within the asset list. Easiest is to right click and select "Save as".
Bonus tip: If you are using Chrome browser you would love the Lithium Studio Bulk Uploader extension by Hinterlands. It will add image previews and a more convenient upload experience.
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