oh wow i never noticed it was there LOL thank you!! but also thats very weird you were having that problem D:
It was a known bug that some sites didn't have the download button (e.g. my other site had the download site button but my first site didn't), good to know the bug's been fixed - my download link is there now too
users can choose to hear the longdesc, where as the alt is automatically read (why its important to be concise)
ok so the source i learned this from did Not mention this is not supported by most browsers ._.