Consider moving to dedicated hardware (UCK-G2, UDM) for better stability and lower maintenance than a Windows machine.
Obtain the unifi-installer.exe 5.4.11 package from a reliable source. Note: As this is a legacy version, it may not be on the main Ubiquiti website. Run the Installer: Double-click unifi-installer.exe . Setup Wizard: Follow the on-screen prompts.
represents a pivotal release in the product's history. At the time, it was widely regarded as a stable build for the 5.4.x series and a trusted foundation for many deployments. Today, it is primarily of historical and educational interest.
Disable old legacy cloud-tethering options within the 5.4.11 settings menu, as the legacy cloud discovery protocols have been deprecated by Ubiquiti's cloud backend. Proceeding with Your Network Setup