Walkthroughs for custom maps.

I'll log in from a different browser and check. It's probably because the link format has changed since then, and I made the file publicly accessible from the beginning. Yes, the link works when downloading from IE. And there's an icon on the archive in the Cloud, indicating that it's accessible via the link.
By the way, I've updated the collection a bit, adding descriptions for 10 maps (from a post by an author in English) and some other minor things. But I haven't re-uploaded it to the Cloud.