Sorry for the issues you are having. You should be able to access the individual instruments presets with the latest version of UltraChannel. Perhaps there was an issue with the installer.
Please try uninstalling the plug-in and running the latest installer, making sure the presets box is checked – https://www.eventideaudio.com/downloads/?product=UltraChannel
The uninstaller can be found at the location below:
Locate the uninstaller at: Start Menu->Control Panel->Programs and Features->Uninstall a Program
Locate the uninstaller at: /Applications/Eventide/Uninstallers/