I obtained this as part of the racial justice bundle but the download link says there are no valid files I can access.
EDIT: It was pointed out below If you download it from the browser page sent to you via e-mail it will work and you just need to install it manually from there. The issue only seems to be when trying to download it via the application's browser. But I was able to download it without a problem through my normal web browser (firefox in this case) so try that first and if it still does not work you may have to contact itch.io support.