The only reliable way how to download such huge files over internet is by using a download manager.
You can use the portable version of Firefox: http://portableapps.com/apps/internet/firefox_portable
Install this. Next (with Firefox) go to https://addons.mozilla.org/en-us/firefox/addon/downthemall/ for the download manager. Click on the green button "Add to Firefox".
Next go to the site with the sampleset you will download.
With the mouse above the downloadlink click with the right mouse button on "start saving with dTAoneClick" and the download starts.
If the server supports resume (most of them do), the download continues after a broken line.