If you still have the EZD3 libraries installed, you need to remove them after the trial ends or else SD3 will ask you to authorize the EZD3 libraries.
Remove the EZX3_EZdrummer3_BrightRoom, EZX3_EZdrummer3_MainRoom, and EZX3_EZdrummer3_TightRoom folders from your EZdrummer libraries path.
The default path, if you haven’t moved the libraries or chosen a custom install path, is
Macintosh HD > Library > Application Support > EZDrummer on Mac
C:\Program Files (x86)\Common Files\Toontrack\EZDrummer on PC.
