The DOFUS client download or extraction did not complete correctly.

- Go to the DOFUS directory (C:\Program Files\Ankama Games\Dofus).

- Delete the file ".versioninfos".

> In some cases, an unnamed file may appear, right-click on this file and select “Properties”

> The "File Type" shows “VERSIONINFOS File”

> Delete this file.

- Launch the updater. It will then download the missing files.