To download the UBNT Discovery 2.5.1 tool, click on the following link:
The primary method for discovering and managing UniFi devices is the UniFi Network Application (formerly UniFi Controller). ubnt discovery 251 download link
If you are using a managed switch, ensure that "Discovery" or "LLDP" isn't being filtered on that specific port. To download the UBNT Discovery 2
: Ensure your computer is on the same Layer 2 network (same VLAN/subnet) as the Ubiquiti devices. ubnt discovery 251 download link