use new system via an update info

ModpackUpdater/UpdateConfig.vb

@@ -6,6 +6,7 @@ Imports Pilz.Cryptography
 
 Public Class UpdateConfig
 
+    Public Property UpdateUrl As String
     Public Property WebdavURL As SecureString
     Public Property WebdavUsername As SecureString
     Public Property WebdavPassword As SecureString
@@ -14,7 +15,7 @@ Public Class UpdateConfig
         File.WriteAllText(filePath, JObject.FromObject(Me).ToString)
     End Sub
 
-    Public Shared Function LoadFromFile(filePath As string)
+    Public Shared Function LoadFromFile(filePath As String) As UpdateConfig
         Return JObject.Parse(File.ReadAllText(filePath)).ToObject(Of UpdateConfig)
     End Function