Download problem with Download Assistant

I bought ZOOM recorder with free WaveLab LE license. After I downloaded the WaveLab LE using “Steinberg Download Assistant” there is some “Veryfying…” message and then error message pops up saying “Download failed”
It happens exactly the same when I tried to downoad other licensed software Cubase LE, tried couple of time (15GB each time!!!) and still unsuccesful