Unable to download Netweaver Sneak preview Java Edition

Hi All,

While trying to download Netweaver Sneak preview Java Edition, Download file 1 it first asks whether to download via coreftp on selecting yes, it gives an error dialog saying NW04SneakPrevJavaSP11.Part1.rar-File not found and a similar message for download 2 file...

but the browser windows keeps on processing

Unable to download

Kindly suggest a remedy