I can't activate prologue 1

[agapito]

Yes I can install and the license shows that it is valid, but when I run it it tells me that it is not activated

[steve]

Mystic, Prologue and Specter not in Cubase 12

As I replied in another thread, if on Windows, you can copy the SynthEngine.vst3 from your Cubase 11 installation and insert it into the Steinberg/Cubase/VST3 folder. You will need the Cubase 11 licence probably, to be able to run them. This technique does not work with Loopmash though.