IeSpellDownloadUrl
Contains a URL pointing to the installation executable of ieSpell.
By default it points to one of the ieSpell mirrors:
FCKConfig.IeSpellDownloadUrl = 'http://www.iespell.com/download.php' ;
but it seems that they are always changing their mirrors an so the URL is quite unstable. We have contacted ieSpell, asking them for a better URL to point to, but we had no response. So, we recommend downloading the latest version from their site (http://www.iespell.com/) and placing it in your server, changing the "IeSpellDownloadUrl" setting to the new location.