This user guide for ExtremeCloud™ IQ (Classic) version 25.4.0 provides comprehensive technical instructions for configuring, managing, and optimizing the ExtremeCloud IQ platform. It details onboarding procedures for real and simulated devices, including Universal APs and Tunnel Concentrators, and outlines advanced onboarding workflows, Digital Twin simulations, and Automatic Frequency Coordination (AFC) for 6 GHz spectrum compliance. This guide covers configuration of network policies, including SSID authentication (WPA2/WPA3, PPSK, MAC), VLANs, RADIUS servers, VPN services, and Layer 2/3 IPsec tunnels. It includes extensive guidance on device templates, classification rules, BLE services, presence analytics, WIPS, and location tracking. Administrative functions such as license management, API token generation, SSO integration with IdP profiles, and audit logging are documented. The document also introduces ML Insights and the CoPilot dashboard for anomaly detection, client health scoring, and network performance analytics. Designed for IT professionals, this guide supports both cloud-managed and locally managed deployments, offering detailed troubleshooting tips, configuration best practices, and support for advanced features like QoS and firewall policies.