2. Download#

To get FS One up and running, download and install from item 1: the base installer file (2022a) and the latest update (2022e). The DLCs are free downloadable content and optional. You may also need to install items 2 and 3. See the blue note below to determine if you need items 2 and 3.

FS One is also marketed as the new SeligSIM 2024

If you want to download the latest version of the InertiaSoft RC Flight Simulator, it is SeligSIM 2024. You can download this version from the new site and user manual below:

Image of three gears for the three parts of FS One.
  1. FS One 2022 base (2022a), latest update (2022e), and 5 free DLCs:
    Downloads via Dropbox

  2. Joystick Gremlin (Release 13.3):

  3. vJoy (vJoySetup.exe, Release

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For news on software updates and new content releases, subscribe to the FS One newsletter: https://michaelselig.substack.com/

Only download and install FS One from trusted sources. FS One is presently only officially delivered from Dropbox as well as from the FS One page on the Internet Archive. You do not need a Dropbox or Internet Archive account to download the files. The Dropbox link includes the base installer (ISO file), the current update, and DLCs (downloadable content packages). The Internet Archive link only includes the base installer and update.

Support FS One and Help it Grow.

Image of three gears for the three parts of FS One.

When you download FS One, we hope it gives you many hours of enjoyment. If you like it, please consider making a donation in the amount of your choosing. Supporting its development will also bring more people into this great hobby.

To get started with your setup, see the FS One 2022 User Manual. A brief summary is below.


[1] If you are using a legacy FS One V1 or V2 interface from prior versions of FS One, you will not need to download/install items 2 and 3 above.

[2] If you use an RC transmitter that has USB simulator output, (e.g. some Spektrum radios and most all OpenTX radios, and many others), then items 2 and 3 above may not be needed. See the “Getting Started” page in the FS One User Manual, and find the note called out as “Approach 4” for more details.

[3] If you are going to use an InterLink controller, you will need to download/install items 2 and 3. See the “Getting Started” page in the FS One User Manual, and find the sections that discuss using the InterLink controllers.


FS One requires a USB simulator controller. This controller can be an RC transmitter that acts directly as a joystick such as the Spektrum NX series RC transmitters and ones from FrSky and RadioMaster. It can also be a USB InterLink® simulator controller or some other. Another option is to use a USB interface that connects to the trainer port of your transmitter. The user manual steps through example setups.

Connection Methods

Joystick Gremlin and vJoy: Joystick Gremlin and vJoy feed FS One with your joystick axes in the order that FS One requires. After you finish your joystick setup, when you run FS One, you will also run Joystick Gremlin at the same time (every time). Inside FS One, the USB interface that you select will be the one named “vJoy Device”.

Your Own Transmitter: An alternative to using Joystick Gremlin + vJoy is to use the channel reassignment features in your transmitter. That maps your transmitter outputs to match the order required by FS One. This feature goes by various names on different brand transmitters. See the FS One “Getting Started” page in the user manual for more details.

FS One V1 and V2 USB interfaces: For users with an FS One V1 or V2 USB interface, you will not need to install Joystick Gremlin or vJoy. FS One 2022, though new, is backward compatible and should be familiar to you.

As with any new simulator, follow the instructions in the user manual to make your setup process go as easy as possible.


Install both any and all FS One, FS One Updates, and DLCs as Administrator. If you are want to use the FS One Power Tools app that comes with update to FS One, see the additional instructions in the User Manual | Power Tools section.

The recommended install sequence is to first install the main program (2022a), and then run the sim one time. You can test the install by clicking on the Flight Training button and playing a lesson. Exit the sim and then install the latest update (2022e). Run the sim again. Exit and install any DLCs. After each of these steps running, the sim one time is only ‘confirmatory’, i.e. you can see it works. But running after each incremental install is not necessary.