The VST plugins load just fine into any host, but the secondary window for registering them doesn't pop up at all. The Humble Bundle instructions say they should open up immediately, which doesn't happen. There's an option in one of the menus that says "Activate Vintage Effects Suite..." but clicking on it does absolutely nothing. It doesn't even freeze like some other people complained, it just... doesn't do anything at all.
I first tried in Reaper and Audacity, but then decided that maybe doing it from inside a Magix product is better, so I loaded up the VSTs in Vegas, but the same thing happens still. I can't register them.
Out of non-Vegas stuff in the bundle, the VSTs were one of the things I was really looking forward to, so this is kind of a bummer.