diff --git a/MSIPackaging/Properties/AssemblyInfo.cs b/MSIPackaging/Properties/AssemblyInfo.cs
index 816d128..910b7b1 100644
--- a/MSIPackaging/Properties/AssemblyInfo.cs
+++ b/MSIPackaging/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.4.1.0")]
-[assembly: AssemblyFileVersion("1.4.1.0")]
+[assembly: AssemblyVersion("1.4.2.0")]
+[assembly: AssemblyFileVersion("1.4.2.0")]
diff --git a/MSIPackaging/Script.cs b/MSIPackaging/Script.cs
index 4e7480d..a82a5c8 100644
--- a/MSIPackaging/Script.cs
+++ b/MSIPackaging/Script.cs
@@ -37,7 +37,7 @@ static public void Main(string[] args)
                               }
                               );
             project.GUID = new Guid("bb0a8e11-24a8-4d7e-a7d6-6fc5bd8166d2");
-            project.Version = Version.Parse("1.4.1");
+            project.Version = Version.Parse("1.4.2");
             project.LicenceFile = path + @"\MSIPackaging\Resources\gpl-3.0.rtf";
             project.BannerImage = path + @"\MSIPackaging\Resources\banner.png";
             project.BackgroundImage = path + @"\MSIPackaging\Resources\background.png";
diff --git a/WinCertes/CertesWrapper.cs b/WinCertes/CertesWrapper.cs
index 5153706..b0e02dc 100644
--- a/WinCertes/CertesWrapper.cs
+++ b/WinCertes/CertesWrapper.cs
@@ -51,10 +51,10 @@ private void InitCertes()
         /// </summary>
         /// <param name="serviceUri">The ACME service URI (endin in /directory). If null, defaults to Let's encrypt</param>
         /// <param name="accountEmail">The email address to be registered within the ACME account. If null, no email will be used</param>
-        public CertesWrapper(int extra = -1, string serviceUri = null, string accountEmail = null)
+        public CertesWrapper(IConfig config, string serviceUri = null, string accountEmail = null)
         {
             _settings = new CertesSettings();
-            _config = new RegistryConfig(extra);
+            _config = config;
 
             // Let's initialize the password
             PfxPassword = Guid.NewGuid().ToString("N").Substring(0, 16);
diff --git a/WinCertes/Config/IConfig.cs b/WinCertes/Config/IConfig.cs
index b41f0cd..2c036d4 100644
--- a/WinCertes/Config/IConfig.cs
+++ b/WinCertes/Config/IConfig.cs
@@ -3,7 +3,7 @@
     /// <summary>
     /// Interface to Configuration Engine
     /// </summary>
-    interface IConfig
+    public interface IConfig
     {
         /// <summary>
         /// Deletes parameter from configuration
diff --git a/WinCertes/Config/RegistryConfig.cs b/WinCertes/Config/RegistryConfig.cs
index 0f4ad67..d1497e7 100644
--- a/WinCertes/Config/RegistryConfig.cs
+++ b/WinCertes/Config/RegistryConfig.cs
@@ -9,12 +9,12 @@ namespace WinCertes
     /// <summary>
     /// Configuration class, managing WinCertes configuration into Windows Registry
     /// </summary>
-    class RegistryConfig : IConfig
+    public class RegistryConfig : IConfig
     {
         private static readonly ILogger _logger = LogManager.GetLogger("WinCertes.WinCertesOptions");
 
-        private static string _registryKey = @"HKEY_LOCAL_MACHINE\SOFTWARE\WinCertes";
-        private static string _subKey = @"Software\WinCertes";
+        private string _registryKey = @"HKEY_LOCAL_MACHINE\SOFTWARE\WinCertes";
+        private string _subKey = @"Software\WinCertes";
 
         /// <summary>
         /// Class constructor. if extra = false, builds the base config. if extra = true, builds the extra certificate config.
@@ -225,6 +225,11 @@ public void DeleteAllParameters()
             {
                 Registry.LocalMachine.OpenSubKey(_subKey, true).DeleteSubKeyTree("extra");
             }
+            for (int i = 2; i < 10; i++)
+            {
+                if (Registry.LocalMachine.OpenSubKey("SOFTWARE").OpenSubKey("WinCertes").OpenSubKey("extra" + i) != null)
+                    Registry.LocalMachine.OpenSubKey(_subKey, true).DeleteSubKeyTree("extra" + i);
+            }
             foreach (string key in Registry.LocalMachine.OpenSubKey(_subKey).GetValueNames())
             {
                 DeleteParameter(key);
diff --git a/WinCertes/Program.cs b/WinCertes/Program.cs
index 3fc2d47..eca715c 100644
--- a/WinCertes/Program.cs
+++ b/WinCertes/Program.cs
@@ -300,10 +300,10 @@ private static void RegisterCertificateIntoConfiguration(X509Certificate2 certif
         /// </summary>
         /// <param name="serviceUri">the ACME service URI</param>
         /// <param name="email">the email account used to register</param>
-        private static void InitCertesWrapper(int extra, string serviceUri, string email)
+        private static void InitCertesWrapper(IConfig config, string serviceUri, string email)
         {
             // We get the CertesWrapper object, that will do most of the job.
-            _certesWrapper = new CertesWrapper(extra, serviceUri, email);
+            _certesWrapper = new CertesWrapper(config, serviceUri, email);
 
             // If local computer's account isn't registered on the ACME service, we'll do it.
             if (!_certesWrapper.IsAccountRegistered())
@@ -354,7 +354,7 @@ static int Main(string[] args)
             // Initialization and renewal/revocation handling
             try
             {
-                InitCertesWrapper(_extra, _winCertesOptions.ServiceUri, _winCertesOptions.Email);
+                InitCertesWrapper(_config, _winCertesOptions.ServiceUri, _winCertesOptions.Email);
             }
             catch (Exception e) { _logger.Error(e.Message); return ERROR; }
             if (_winCertesOptions.Revoke > -1) { RevokeCert(_domains, _winCertesOptions.Revoke); return 0; }
diff --git a/WinCertes/Properties/AssemblyInfo.cs b/WinCertes/Properties/AssemblyInfo.cs
index 80f24da..295afee 100644
--- a/WinCertes/Properties/AssemblyInfo.cs
+++ b/WinCertes/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.4.1.0")]
-[assembly: AssemblyFileVersion("1.4.1.0")]
+[assembly: AssemblyVersion("1.4.2.0")]
+[assembly: AssemblyFileVersion("1.4.2.0")]