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Terrain Download Failed. A350 v1.1.7


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I simply cannot download the terrain data. The OIS will either throw a "Terrain Download Failed" error or just get stuck in an infinite "Downloading" state.

Troubleshooting steps done so far:

  • I have cleared the WASM files in \LocalState\WASM\MSFS2024\inibuilds-aircraft-a350 4 times (the obj, lib, cache files as outlined in the clearing WASM guide)
  • I have deleted the work folder itself \LocalState\WASM\MSFS2024\inibuilds-aircraft-a350\work 
  • I have deleted the entire inibuilds-aircraft-a350 folder in \LocalState\WASM\MSFS2024
  • I have done one full reinstall
  • I have tested with turning of windows defender realtime scanning
  • I have added windows defender exceptions as outlined in this inibuilds guide https://forum.inibuilds.com/topic/34534-how-to-download-terrain-data-via-the-ois/
  • I have tried removing my Navigraph credentials

    A full sim restart is done after every step above. None of the troubleshooting steps I've done above helped. Still the same problem.

How do I know It's stuck at downloading?

  • I left it running with the button showing "downloading" for 45-minutes.

Is it a sim to Internet communication problem?

  • Everytime I cleared the WASM folder, I am able to download and update the Navigraph data perfectly fine, so the sim can communicate to the internet fine.

 

Microsoft Flight Simulator 2024 Screenshot 2025.11.24 - 01.52.56.78.jpg

Microsoft Flight Simulator 2024 Screenshot 2025.11.24 - 01.56.21.60.jpg

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