Fix download/upload timeout + Fix some warnings

OpenSaveCloudClient/Core/LogManager.cs

@@ -20,10 +20,16 @@ namespace OpenSaveCloudClient.Core
             messages = new List<Log>();
         }
 
-        public static LogManager GetInstance()
+        public static LogManager Instance
         {
-            if (instance == null) { instance = new LogManager(); }
-            return instance;
+            get
+            {
+                if (instance == null)
+                {
+                    instance = new LogManager();
+                }
+                return instance;
+            }
         }
 
         public void AddError(Exception ex)