GNU/Linux MX 19 Installing Broadcom BCM4352 Driver Guide
The linked tutorial shows you step-by-step How to Install Broadcom BCM4352 Wi-fi/Bluetooth Driver on MX GNU/Linux 19.
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 MX Broadcom BCM4352 Driver Installation Guide