During Sample Installation, you can choose the installation destination, where CUBE will install the samples. If you did not choose a custom installation destination, check in the default installation location here:
Mac
Samples: /Users/Shared/Lunacy Audio/CUBE/Samples
Windows
Samples: C:\Program Files\Common Files\Lunacy Audio\CUBE\Samples
You can also change the sample folder location after installation by opening CUBE’s settings and clicking the “Change Sample Folder Location” button in the Engine tab.