Download GSX for FSX legally through the developer or an authorised retailer. Learn which edition works, how licensing works and what to avoid.
GSX for FSX is a paid add-on, so the legal download comes from the product developer's official store or an authorised retailer. Buy the original GSX edition that explicitly supports Microsoft Flight Simulator X or FSX: Steam Edition; GSX Pro is a different product for newer Microsoft Flight Simulator releases.
Where is the legitimate GSX for FSX download?
GSX is developed by FSDreamTeam, and a legitimate copy should come through its official sales and account system or a retailer authorised to sell the product. A retailer may supply the licence while directing you to the developer's installer.
Our guide to identifying authorised flight-simulator add-on sellers explains what to check before paying. Avoid shared accounts, copied licence keys, key generators and modified installers advertised as the full version.
A genuine purchase should provide:
- A product listing that names FSX or FSX: Steam Edition as supported.
- An order record, account entitlement or valid activation details.
- Download instructions supplied by the developer or authorised seller.
- Access to an unmodified installer rather than an unofficial repack.
Which GSX version works with FSX?
The original FSX-era GSX product is the correct edition; GSX Pro is not compatible with FSX.
| Product | Intended simulator | Suitable for FSX? |
|---|---|---|
| Original or FSX-era GSX | FSX and the platforms stated on its product listing | Yes, provided FSX or FSX: Steam Edition is explicitly supported |
| GSX Pro | Microsoft Flight Simulator 2020 and 2024 | No |
| GSX expansion or upgrade | Depends on the base product and listing | Only if you already own any required base GSX licence |
A mistake we see constantly is buying GSX Pro because it has the newer name. Check our explanation of GSX editions and simulator compatibility if the product names are unclear. Do not assume that an MSFS or Prepar3D licence also covers FSX.
How do I buy and download the right copy?
- Read the supported-platform list. It must name Microsoft Flight Simulator X or FSX: Steam Edition, as appropriate.
- Check whether it is a complete product. An expansion, upgrade or optional feature pack may require the original GSX package.
- Purchase through an official route. Use the developer's sales system or an authorised retailer rather than a file-sharing source.
- Follow the supplied download instructions. Sign in to the account associated with the purchase and obtain the installer specified for the FSX product.
- Keep the receipt and licence details. They may be needed when reinstalling or activating after a computer change.
Once downloaded, follow our FSX-specific GSX installation and activation procedure. FSX boxed and Steam Edition can use different installation locations, so let the supported installer detect the simulator rather than copying GSX files manually.
Can I download GSX for FSX free?
The complete licensed version of GSX is not freeware. An installer being freely accessible does not grant ownership or remove its activation requirements; full use still requires a legitimate licence.
If the FSX edition is no longer offered to new buyers, an unofficial archive does not become legal. Existing customers should retrieve it through their purchase account or the developer's official recovery process. New buyers should not substitute GSX Pro, because it will not work in FSX.