For example, in src/addons/bulk_uploader/docs/example_upload_auctions.txt on each row it has an image link, like http://www.geodesicsolutions.com/demos/photos/bmw6series1.jpg along with the column before it.

In those sample bulk upload files, replace all the references to http://geodesicsolutions.com (note the .com) to https://geodesicsolutions.org (note the .org). Also be sure to change the http to https.

But the new image URLs need to work. See if we can track down the original images, if not just find some "public domain" or "royalty free" stock images, and add them to the geodesicsolutions-community/website repo, then link to them in the txt files.