The CT-WN4320Z often works out of the box with the rt2800usb kernel module. If not:
sudo apt update
sudo apt install firmware-ralink
sudo modprobe rt2800usb
For Arch Linux based systems:
sudo pacman -S linux-firmware
Before you give up, ensure you have:
Cause: Signal interference or legacy USB support disabled. Solution: Always use a USB 2.0 port (black plastic inside) rather than USB 3.0 (blue). Alternatively, use a USB 2.0 extension cable to move the adapter away from interference.
Do not download drivers from "driver update" pop-up ads or unknown third-party aggregators. They often bundle malware or adware. Use these verified sources. Driver Wlan Usb 2.0 Ct-wn4320z
This adapter is not officially supported on macOS (especially Apple Silicon M1/M2/M3). However, some generic adapters use the Chipset RTL8188EU for which community drivers exist:
Recommendation: Do not use this adapter with modern Macs. Buy a native USB adapter certified for your macOS version instead. The CT-WN4320Z often works out of the box
Many retail packages included a mini CD. However, modern computers lack optical drives, so this method is outdated.
Direct driver names to search for: