My guess is that the trial version has been eliminated due to the recent transition from eLicenser to Steinberg Licensing. This is yet another Steinberg product which is caught in the mysterious transitional phase. These are truly great plugins. However, I would hold off if I were you until it is confirmed or denied that they will make the transition to the new licensing system. These plugins are over ten years old. Unbelievably, they are not on the list of recently announced unsupported products …
Steinberg Dropping Support for several products - Announcements - Steinberg Forums
That gives me a little hope, but not much.
At this point I would say … “purchase at your own risk” 
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