Hello,
I have the same experience. But in my case it helps to not pause download. I tried it on 3 PCs and only on one computer it ends with fails durring download. On other two, I lost lot of downloaded data after pausing download. So it seems that its kind of related with PC config. Win 7 and win 10 was tested with same result. At the end, I download that strings in one whole day session (yes, I have slow connection) and it works.
I would realy apreciate possibility to buy this sound pack physicaly with some memory medium.