Hi. I haven't installed the core library yet. I noticed that in the installation process the stand alone app was not checked. I left it that way and installed it anyway. So Of course I don't have a standalone app for ezdrummer 3 but still have the vst to use it on a daw software. And it has sounds. So don't really know what is the core library for, and if I still have to install it despite the fact that is enough for me to use it on a daw software.