The older .jar tool is sometimes still available on community forums or older support pages, such as searching for "Ubiquiti Device Discovery Tool" on Ubiquiti Community.
If you are running the legacy v2.3 Java tool, keep the following in mind: Chrome support for Ubiquiti Device Discovery Tool ubnt discovery 2.3 download software
Forgot admin password to a Rocket M5?
Once downloaded and installed, follow these steps to find your devices: The older
file version is generally compatible with Windows, Mac, and Linux ("All Platforms"). Ubiquiti Community Modern Alternatives (Recommended) ubnt discovery 2.3 download software