diff --git a/ModpackUpdater/AppConfig.vb b/ModpackUpdater/AppConfig.vb
index 09ff3a9..da3a32b 100644
--- a/ModpackUpdater/AppConfig.vb
+++ b/ModpackUpdater/AppConfig.vb
@@ -4,8 +4,12 @@ Imports Newtonsoft.Json.Linq
 
 Public Class AppConfig
 
-    Public Property LastMinecraftProfilePath As string
-    Public Property LastConfigFilePath As string
+    Public Property LastMinecraftProfilePath As String
+    Public Property LastConfigFilePath As String
+    Public Property KeepLocalFiles As New List(Of String) From {
+        "OptiFine_1.7.10_HD_U_E7.jar"
+    }
+    Public Property RemoveLocalFiles As Boolean
 
     Public Shared ReadOnly Property Instance As AppConfig
         Get
diff --git a/ModpackUpdater/Form1.vb b/ModpackUpdater/Form1.vb
index 51149ad..95fe296 100644
--- a/ModpackUpdater/Form1.vb
+++ b/ModpackUpdater/Form1.vb
@@ -82,7 +82,7 @@ Public Class Form1
         AddHandler updater.InstallProgessUpdated, AddressOf Update_InstallProgessUpdated
         AddHandler updater.CheckingProgressUpdated, AddressOf Updated_CheckingProgresssUpdated
 
-        Dim result As UpdateCheckResult = Await updater.CheckForUpdates(True)
+        Dim result As UpdateCheckResult = Await updater.CheckForUpdates(AppConfig.Instance.RemoveLocalFiles)
         Dim everytingOk As Boolean = False
 
         If result Is Nothing Then
diff --git a/ModpackUpdater/UpdateSyncAction.vb b/ModpackUpdater/UpdateSyncAction.vb
index 92e7d26..ec6f578 100644
--- a/ModpackUpdater/UpdateSyncAction.vb
+++ b/ModpackUpdater/UpdateSyncAction.vb
@@ -1,4 +1,9 @@
-Public Enum UpdateSyncAction
+Imports Newtonsoft.Json
+Imports Newtonsoft.Json.Converters
+
+<JsonConverter(GetType(StringEnumConverter))>
+<Flags>
+Public Enum UpdateSyncAction
     None
     NewFile
     RemovedFile