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.
I was able to verify that this issue is present on Crowdin. The string now seems to be found at
..\logic\src\GameInstances\components\GameErrorReporter\index.tsx:168
instead.