Maybe I’ve made something wrong, but I can’t figure what.
I’ve just applied the template on a polish first WP installation, before doing anything else.
It should have moved those images to your media library and updated the URLs on import. We’ll do some testing to see why that isn’t happening.
As there are only 4 images, i would suggest the simplest ( albeit manual ) is to download the Images from those URLs to your desktop. Then upload them to your media library then manually replace them in the Page.