The Linux download seems to be broken: clicking on it opens the download popup, as with the other platforms, but no file-saving dialogue appears. :/(This was observed under Ubuntu Linux 18.04.4, using Firefox 76.0.1 (64-bit))
Thank you for providing this information and we're sorry to hear that you experienced this issue. We will be updating this demo after Starlight Shores launches and be keeping this error report in mind when the time comes.
Fair enough! I'm glad if the report helps. ^_^