GNU/Linux Zorin OS Installing Broadcom BCM4352 Driver Guide
The linked tutorial shows you step-by-step How to Install Broadcom BCM4352 Wi-fi/Bluetooth Driver in Zorin OS 12.x/15.x LTS GNU/Linux.
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 BCM4352 Driver Installation Guide