Unplug the InterLink DX controller, switch USB ports (use a direct USB 2.0/3.0 port, avoid unpowered hubs), and try again. Windows Firewall or antivirus blocking the launcher.

This occurs if you bought a used copy of RealFlight 9.5 and the previous owner did not unregister it. RealFlight serial numbers are permanently tied to one user account. You must contact the seller to have them transfer the license, or contact Horizon Hobby Support with proof of purchase to request a registry reset. "Error Connecting to Registration Server"

Essentially, your serial number is your license to use the software. Unlike modern versions tied directly to your Steam account, older DVD and digital versions of RealFlight 9.5 rely on this serial number for installation and activation.

As Jack continued to use the software, he discovered that RealFlight 9.5 had much more to offer. He could create custom scenarios, fly in different parts of the world, and even practice emergency procedures. The software became an essential tool for Jack, helping him to improve his flying skills and knowledge.

Did you purchase the or the digital Steam version ? What exact error message displays on your screen? Which controller are you trying to connect?

If you have lost your serial number, reach out to Horizon Hobby support. If you have not purchased yet, buy directly from Steam or a certified dealer. The price is minimal compared to crashing a real $500 RC helicopter on its maiden flight.

RealFlight validates serial numbers against a live database whenever you attempt to join an online multiplayer session. Pirated keys are instantly banned from public lobbies.

Depending on how you purchased the software, your serial number will be located in different places. A. Physical Edition (DVD/InterLink Controller)

If you forget to deactivate and your old computer is broken or inaccessible, contact Horizon Hobby support. They can manually reset activations twice per year per customer.

If you have the newer Steam-based version (9.5S), the process is even more straightforward.

Check the quick-start insert card included in the packaging. 2. Digital Purchase via Steam

Ensure your computer is connected to the internet, then click OK to register the software with the Knife Edge servers. Recovering a Lost RealFlight Serial Number