M4A audio downloader

This tool saves the original file and nothing else. There is no conversion: if the link serves something other than M4A or AAC, the real format is named and the matching downloader is pointed at instead of transcoding behind your back. Streaming sites, logins, and paywalls do not work; hosts that refuse cross-origin reads cannot be fetched from a browser tab, and files past the 100 MB ceiling are refused. A publicly reachable file is not automatically yours to take; only save what you own or are allowed to save.