Been trying to download for three days, a couple of times a day, with no luck at all. Considering how good my Humble Bundle experience typically is, I've been pretty disappointed this time. Why not sell these ones DRM-free, if watermarking is the issue? I have no intention of hosting or pirating, but this seems to be a textbook case of DRM interfering with nice paying customers ... and I'd be surprised if pirated PDFs of all of this stuff weren't available on torrent sites. Isn't this doing exactly the opposite of what it's supposed to be doing?
