I just tried "VSL for Dorico v1.0.67". And it works ;-) - Maybe delete this posting, the error was on my side.
There is a new Playback Template (Wiedergabevorlage) for VSL Synchron Elite Strings. Unfortunately, if I apply this template, it seems to load Solo String Presets from the SYNCHRON-ized Special Edition, not Patches from Synchron Elite Strings. I double checked my configuration, this seems to be a bug. Maybe you check it out when you get a chance.
Thanks for the library, it is excellent!