The phrase typically refers to a common troubleshooting issue where a user's serial number is flagged as "hot" (already in use or unauthorized) by the software's validation system. This often happens with second-hand copies or activation errors.
If your serial number isn't working or you're seeing "already used" errors: realflight 95 serial number hot
If you don't already own a license, you have two straightforward ways to get RealFlight 9.5S. The correct method is purchasing the software officially from Horizon Hobby, which includes the controller. Inside the box, you'll find a card with the Steam activation key. Another less common method is that some third-party online stores occasionally sell leftover stock of genuine, unused Steam keys for RealFlight 9.5S. However, this is a niche and potentially risky way to buy; Horizon Hobby's official product is generally your best bet. The phrase typically refers to a common troubleshooting