I have seen a few people having issues with downloading the Artwork Installer so I went ahead and grabbed the latest version, along with the Preview Videos and 128mb Fanart and have uploaded the whole thing to share here.
Xbox Artwork Installer 3.1.7z
Just FTP to your console and run the xbe. Choose in the options if you wish to install the 128mb Art and/or the Preview Videos or not.
@Rocky5 I hope this is ok to share here, if not then please let me know and I will remove it immediately.