Occasional resume error and inaccurate download progress

[Will13hf]

Hi, thanks for the great library. Sometimes when network error occurs during download or multiple pause and resume , ReceiveBytes used to constantly change from the real bytes received to 68b or rarely 136b with a 100% download progress. Thanks for the great and selfless service you are rendering.

[dongzhaosheng73]

I also had the same problem with actual downloads and entry not matching

[Cubody]

Same thing. It occurs randomly on many files. I'm using new downloader instance for every file and doing work in parallel.