How to quickly download a 4GB file?

Question

C++ / C#

Good evening.
There was a need to write a program that will download a file weighing 4GB.
I used the WebClient and simply made a button in the program, when clicked, the download of the same file began. Added a progress bar and launched the program. I pressed the button, after which I realized that the download of such a file takes a long time (20 minutes). I will not consider the method of compressing a file into an archive, you need to download it without an archive.
How can this be done?
I read about downloading files in parts, but I did not find working examples anywhere, etc.
Please help me find what I need.
Thank you.

Answer 1

Pass in the title Rangeto download the desired part. But what's the point if you're already pumping one part at maximum speed.

Answer 2

Does the same file download faster from the same place and at the same time of the day by other means (browser, web downloaders)?
If 'no' - then the reason is more likely in the Internet provider or on the sending side (they may limit the speed or the provider is simply overloaded
) Is there a clumsy implementation? As an option, implement a multi-threaded download (sometimes providers both on the sending side and local ones limit the speed per connection and not for the entire session).