the problem is that you pin the wrong application…Zerynth is composed by 2 applications: the installer and the Zerynth Studio.
The installer is the Zerynth.exe file in the path “C:\Program Files\Zerynth”.
Zerynth Studio is the main application under the path “C:\Users\your_user\zerynth2”.
To start correctly Zerynth Studio, you need to run always the Zerynth installer (Zerynth.exe) because the installer asks you which version you want to start, and performs in background other checks regarding updates and patches.
So if you want to pin in your taskbar the Zerynth Studio and start quickly the application, you have to go inside the folder “C:\Program Files\Zerynth” and right click over Zerynth.exe file; then you have to click the “pin to taskbar” option.
Zerynth icon will appear on your taskbar and from then on you can start from there the Zerynth Studio application.
Hope that this can help you