[Plugin: Sermon Browser] Can’t download one particular sermon

hello, i am using the Sermon Browser plugin for wordpress and am having trouble downloading sermons. When I click download then select where to save the file, the download completes immediately and the file says that its size is 0 bytes. here is the URL:

https://www.alliancechristiancenter.org/development/resources/sermons/?sermon_id=3

Any help would be appreciated, thanks!