The Fusion-IR Expansion Packs for Slate Digital VerbSuite Classics can be downloaded here.
Once the libraries are installed, you can access the Bricasti Expansion within VerbSuite Classics by clicking "Load Device". The expansion is named FG-BM7 as shown in the image below.
If you'd like to change the location of the library, please refer to the VerbSuite Classic user guide here (page 22): VerbSuite Classics User Manual
If you need additional assistance, please submit a support ticket here.