Merge pull request #2088 from upupming/master

Fixed: .net download link

shadowsocks-csharp/Program.cs

@@ -38,7 +38,7 @@ namespace Shadowsocks
                 "Shadowsocks Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
 
                 Process.Start(
-                    "http://dotnetsocial.cloudapp.net/GetDotnet?tfm=.NETFramework,Version=v4.6.2");
+                    "https://www.microsoft.com/download/details.aspx?id=53344");
                 return;
             }