The string "Failed to download file, the file contents differ from what was expected." contains comma-stringing between "file" and "the". This may be fixed by simply replacing the comma by a period and capitalising the "t" in "the". The string can be found in packages/llogic/src/GameInstances/components/GameErrorReporter/index.tsx:160 (readout from Crowdin's context for this string).
This string is present in all the Launcher versions (thus not only the version I provided), as it is a source string.