Downloading files in Visual Studio - vb.net

Question

I am using the code recommended by Microsoft.
My.Computer.Network.DownloadFile("mydlurl", "C:\jb\jb.exe")
But that throws an unhandled exception on my friends computer, and some other people, but some can use it.
I tried using downloadasync with a progress bar, but it freezes before it even starts.(Does nothing)
Here is my code that runs an unhandled exception on some computers.
If My.Computer.FileSystem.FileExists("C:\jb\jb.exe") Then
Else
'jbinfo.Text = "Please wait as your file is being downloaded."
My.Computer.Network.DownloadFile("http://download1580.mediafire.com/g/abcdefghijklmnop/myfile.exe", "C:\jb\jb.exe", "", "", True, 500, True) '<Maybe fix. Lets try.
End If
The exception message is:
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.Net.WebException: The server committed a protocol violation. Section=ResponseStatusLine
at Microsoft.VisualBasic.MyServices.Internal.WebClientCopy.DownloadFile(Uri address, String destinationFileName)
at Microsoft.VisualBasic.Devices.Network.DownloadFile(Uri address, String destinationFileName, ICredentials networkCredentials, Boolean showUI, Int32 connectionTimeout, Boolean overwrite, UICancelOption onUserCancel)
at Microsoft.VisualBasic.Devices.Network.DownloadFile(String address, String destinationFileName, String userName, String password, Boolean showUI, Int32 connectionTimeout, Boolean overwrite, UICancelOption onUserCancel)
at Microsoft.VisualBasic.Devices.Network.DownloadFile(String address, String destinationFileName, String userName, String password, Boolean showUI, Int32 connectionTimeout, Boolean overwrite)
at MyApp.Main.Button1_Click_1(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Answer 1

If I run this I get a ProtocolViolation, this is probably because DownloadFile expects a 200 OK, followed by the download, but Mediafire is sending you a 302 FOUND instead and redirects the request to a new location where the download page for this download is.
This is to prevent you from using MediaFire as a file hosting platform to distribute files without people actually knowing you're using MediaFire (makes sense right?).
You won't be able to use wc.DownloadFile or any other .NET framework method that expects a file here. You'll need to actually implement the proper 'handshake' with Mediafire so to speak, so they send you a new location, then go there and show that to the users.