I'm having the same issue (tested with the Zelda soundpack). Interestingly enough, when I right-click on the pack and choose copy URL, it works fine (https://www.wincustomize.com/download.asp?p=sb&LibID=69&skinid=87&file=CopyofOcarinoftimesoundpack.soundpack&source=1)I'd contact support by emailing support@stardock.com and see what they can do.
Yup thats another issue, I can right click and paste into my browser, but that defeats the object, mail fired off to support, but I won't hold my breath as they hardly ever get replied to all I usually get is a message after 3 weeks or so saying no response so closed

FYI report number ZDW-654622