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An extension is causing the problem – Certain extensions (particularly download managers) have the potential of contributing to this particular issue.In this case, you should be able to resolve the issue by either stopping the real-time protection of your 3rd party AV or uninstalling it altogether. This has the potential of conflicting with Google’s own virus scanning tool, which might end up making the waiting time a lot longer than usual.
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If this scenario is applicable, there’s nothing you can do about it as the Content-Length header is optional. Server is missing the Content-Length header – If you noticed that the download stays at 100% for a lot of time before finally showing as completed, chances are the issue occurs because the server you’re downloading from is missing the “Content-Length” header.
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