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This question already has an answer here:

While downloading certain files on Google Chrome, the file size is displayed the moment the download begins. For some others, the file size is never displayed until the entire file finishes downloading.

In what cases does this happen ? And why?

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marked as duplicate by Ƭᴇcʜιᴇ007, Heptite, Tog, and31415, Shekhar Mar 30 '14 at 5:57

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Since you are specific about chrome: does the same happen with different browsers? – Jasper Mar 28 '14 at 11:19
up vote 4 down vote accepted

This is perhaps due to a missing "Content-Length" header in the HTTP response from the server, i.e. the server doesn't tell the browser how big the downloaded file will be, so the browser can't display a progress bar or the target file size.

This is no error because the Content-Length header is optional, so there is nothing to worry about and nothing you could do about this.

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