Very dead necropost (found it looking for something else) but a MySQL error on a server means that there's an error on the server, and the webmaster has to fix it (usually by rewriting the code that caused it). The only thing the user can do about it is to email the site admin or webmaster giving the full details - URL of the page, which link you were trying to download, which version of what browser you were using (yes - that can sometimes cause a problem), etc.