Instead of looking for a serial key, here are the official ways to use and activate Speedify:

Because Speedify relies on cloud-based VPN endpoints, a local "serial key" typically won't work for long—if at all—as the service must verify your subscription on their servers. Are you having trouble logging into an existing account , or Speedify Router License Activation Guide

Official licenses are available directly through the Speedify website or authorized retailers like Markertek . Why Avoid "Serial Key" Downloads?