GNU/Linux Zorin OS Installing Broadcom BCM43224/BCM43225 Driver Guide
The linked tutorial shows you step-by-step How to Install Broadcom BCM43224/BCM43225 Wi-fi/Bluetooth Driver on Zorin OS 12.x/15.x LTS GNU/Linux – Step by step Tutorial.
The Package Provides the Source Code for the wl Kernel Modules and makes use of the DKMS Build Utility to Install them for the Running Kernel.

GNU/Linux Zorin OS Broadcom BCM43224/BCM43225 Driver Installation Guide