More installer migration

Application/Update/UpdateCheck.cs

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+using FeedCenter.Properties;
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Net;
+using System.Reflection;
+using System.Threading.Tasks;
+
+namespace FeedCenter.Update
+{
+    public static class UpdateCheck
+    {
+        public static VersionFile VersionFile { get; private set; }
+        public static string LocalInstallFile { get; private set; }
+
+        public static bool UpdateAvailable { get; private set; }
+
+        public static Version CurrentVersion
+        {
+            get { return Assembly.GetExecutingAssembly().GetName().Version; }
+        }
+
+        public static bool CheckForUpdate()
+        {
+            VersionFile = VersionFile.Load();
+
+            if (VersionFile == null)
+                return false;
+
+            var serverVersion = VersionFile.Version;
+            var localVersion = CurrentVersion;
+
+            UpdateAvailable = serverVersion > localVersion;
+
+            return true;
+        }
+
+        internal static async Task<bool> DownloadUpdate()
+        {
+            if (VersionFile == null)
+                return false;
+
+            var remoteFile = Settings.Default.VersionLocation + VersionFile.InstallFile;
+
+            LocalInstallFile = Path.Combine(Path.GetTempPath(), VersionFile.InstallFile);
+
+            var webClient = new WebClient();
+
+            await webClient.DownloadFileTaskAsync(new Uri(remoteFile), LocalInstallFile);
+
+            return true;
+        }
+
+        internal static bool InstallUpdate()
+        {
+            if (VersionFile == null)
+                return false;
+
+            Process.Start(LocalInstallFile, "/passive");
+
+            return true;
+        }
+    }
+}