Failed the file checksum test

Bugs and Support
1

Hi
After running the installer , the downloader gets stuck and doesnt letme run zwift

it keeps on repeating a similar log

[20:44:03 2025-11-30]
Downloader: ERROR: “data\Noesis\Blend_Data\Images\Routes\card_route_greatestlondonflat_1024.jpg” completed download successfully, but failed the file checksum test (manifest=-1093833182, local=-1844390226)!

[20:44:03 2025-11-30]
Downloader: WARNING: “data\Noesis\Blend_Data\Images\Routes\card_route_greatestlondonflat_1024.jpg” failed to download with code: 0!

[20:44:03 2025-11-30] Downloader: Attempting to try again downloading “data\Noesis\Blend_Data\Images\Routes\card_route_greatestlondonflat_1024.jpg”
[20:44:03 2025-11-30] Launcher: DoUpdateCheck() Called.
[20:44:03 2025-11-30] Launcher: ZwiftApp.exe is not running.

2

What happens if you follow this process:

3

Hi @Too_Many_Kebabz, welcome to the Forums! I’m Francisco from Zwift Support.

That “failed the file checksum test” message usually pops up when Zwift finds something off with the game files; often due to a corrupted install, an interrupted update, or a hiccup during download.

The quickest fix is usually a clean reinstall, just like Paul mentioned. Grab a fresh installer from zwift.com/download and follow the steps in the article above.

If it still gives you trouble, don’t hesitate to open a support ticket so we can dig in further.

Ride On.

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