Microsoft Visual C++ Redistributable

- Extend check to Microsoft Visual C++ Redistributable for Visual Studio 2015 - 2019
- Fixes #409

Author: bitbeans

SimpleDnsCrypt/Config/Global.cs

@@ -25,14 +25,14 @@ public static class Global
 		public const string ApplicationUpdatePublicKey = "RWTSM+4BNNvkZPNkHgE88ETlhWa+0HDzU5CN8TvbyvmhVUcr6aQXfssV";
 
 		/// <summary>
-		/// Microsoft Visual C++ Redistributable for Visual Studio 2017 (x86)
+		/// Microsoft Visual C++ Redistributable for Visual Studio 2015 - 2019 (x86)
 		/// </summary>
-		public const string RedistributablePackage86 = "https://aka.ms/vs/15/release/VC_redist.x86.exe";
+		public const string RedistributablePackage86 = "https://aka.ms/vs/16/release/VC_redist.x86.exe";
 
 		/// <summary>
-		/// Microsoft Visual C++ Redistributable for Visual Studio 2017 (x64)
+		/// Microsoft Visual C++ Redistributable for Visual Studio 2015 - 2019 (x64)
 		/// </summary>
-		public const string RedistributablePackage64 = "https://aka.ms/vs/15/release/VC_redist.x64.exe";
+		public const string RedistributablePackage64 = "https://aka.ms/vs/16/release/VC_redist.x64.exe";
 
 		/// <summary>
 		///     The folder where the dnscrypt-proxy lives in.

SimpleDnsCrypt/Helper/PrerequisiteHelper.cs

@@ -20,6 +20,15 @@ public static bool IsRedistributablePackageInstalled()
 			{
 				if (Environment.Is64BitProcess)
 				{
+					//check for 2015 - 2019
+					var parametersVc2015to2019x64 = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\DevDiv\VC\Servicing\14.0\RuntimeMinimum", false);
+					if (parametersVc2015to2019x64 == null) return false;
+					var vc2015to2019x64Version = parametersVc2015to2019x64.GetValue("Version");
+					if (((string)vc2015to2019x64Version).StartsWith("14"))
+					{
+						return true;
+					}
+					//check for 2017
 					var paths2017X64 = new List<string>
 					{
 						@"Installer\Dependencies\,,amd64,14.0,bundle",
@@ -39,6 +48,15 @@ public static bool IsRedistributablePackageInstalled()
 				}
 				else
 				{
+					//check for 2015 - 2019
+					var parametersVc2015to2019x86 = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\DevDiv\VC\Servicing\14.0\RuntimeMinimum", false);
+					if (parametersVc2015to2019x86 == null) return false;
+					var vc2015to2019x86Version = parametersVc2015to2019x86.GetValue("Version");
+					if (((string)vc2015to2019x86Version).StartsWith("14"))
+					{
+						return true;
+					}
+					//check for 2017
 					var paths2017X86 = new List<string>
 					{
 						@"Installer\Dependencies\,,x86,14.0,bundle",