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Installation

Because of previous drama, this mod is distributed as an archive containing xdelta files and an install script. You will need an original, unmodded installation of the Aerosoft Twin Otter 1.1.1 (installed using Aerosoft One, the legacy Aerosoft installer, or by other means) so the installation process can read the original files and write the changed files to the mod folder. Your original files will not be modified.

Mod is distributed inert

Until the install script has been executed, the mod will be inactive.

You will still need to have the base model — the aerosoft-aircraft-twin-otter folder — in your Community folder for the mod to work.

Contents of the distributed archive

  • charliebravo-aircraftmod-twin-otter: the mod itself. You must unpack this to use the mod.

  • companion_mods: the optional extras, the Turbine Duke sound mod and two alternative camera packages (see Companion Mods). Copy the ones you want into your Community folder, each as its own folder next to the main mod.

  • historic_ndb_userpoints.csv: this file can be imported in Little Navmap to show historic (decommissioned) NDB beacons. It should not be unpacked to the Community folder.

  • presets/twotter-events.txt: contains Mobiflight-style presets that I generated for FSUIPC7. Work in progress.

Upgrading from an older release

If you still have z_aerosoft-twin-otter_propblur_mod in your Community folder, delete it. The prop discs are part of the main mod now, and the old mod would override them.

If you have charliebravo-z-cameras-twin-otter-classic, delete it too: the stock views are part of the main mod now, and the old package hides the copilot. For the same reason, replace a -flat or -custom camera package from an older release with the copy from companion_mods. The install script stops and tells you if it finds either.

Step by step

  1. Unpack charliebravo-aircraftmod-twin-otter directly into your Community folder, or wherever you keep your Community add-ons, plus any companion mods you want from companion_mods, each as its own folder (not the companion_mods folder itself).

  2. Open the folder charliebravo-aircraftmod-twin-otter.

  3. Optionally, if you're paranoid or they are actually after you: examine INSTALL.bat and INSTALL.ps1, and overwrite the xdelta executable with a version you trust.

  4. Double-click INSTALL.bat.

  5. Follow the prompts and select an unmodified aerosoft-aircraft-twin-otter folder.

In a perfect world, the changes are applied and you end up with a working mod.

The sound mod

If you unpacked the soundmod:

  1. Open the folder charliebravo-soundmod-twin-otter-turbineduke.

  2. Double-click INSTALL.bat.

  3. Follow the prompts and select your bksq-aircraft-turbineduke folder (in case it's not auto-detected).

If it goes wrong

Before you report an installation error, please try reinstalling a fresh copy of the Aerosoft Twin Otter and trying with that folder. If the error persists, please get in touch so we can figure out what's happening happen. The installer should work with all popular versions of v1.1.1.

Reviewed 2026-10-23.