To install the EZdrummer 3 Core Library on macOS, you must use the Toontrack Product Manager
The download corrupted due to an unstable internet connection. Fix: Go to the Product Manager, find the Core Library, click the down arrow, and select “Clear Downloaded Files.” Then click Install again to start a fresh download.
In the Product Manager, download:
After the download finishes, the Product Manager will prompt you to install. Click . The Mac installer (.pkg) will launch. Follow the on-screen prompts.