welcome to the forum.
see:
- https://forum.inaturalist.org/t/preferred-ways-of-batch-downloading-a-subset-of-the-inaturalist-data/18342/7
- https://forum.inaturalist.org/t/download-all-sounds-and-photos-from-your-project/28300/2
- https://forum.inaturalist.org/t/list-all-image-urls-in-exported-csv-file/17606
just for reference, this would get all observations with CC BY-NC, CC BY, and CC0 licenses: https://www.inaturalist.org/observations?photo_license=CC-BY-NC,CC-BY,CC0&place_id=any&taxon_id=56061