diff --git a/src/updatechecker.h b/src/updatechecker.h
--- a/src/updatechecker.h
+++ b/src/updatechecker.h
@@ -1,3 +1,22 @@
+/*
+  Copyright © 2017 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  serialplot is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  serialplot is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with serialplot.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #ifndef UPDATECHECKER_H
 #define UPDATECHECKER_H
 
@@ -6,6 +25,8 @@
 #include <QNetworkReply>
 #include <QList>
 
+#include "versionnumber.h"
+
 class UpdateChecker : public QObject
 {
     Q_OBJECT
@@ -13,7 +34,6 @@ public:
     explicit UpdateChecker(QObject *parent = 0);
 
 signals:
-    void updateFound();
     void checkFinished(bool found, QString newVersion, QString downloadUrl);
     void checkFailed(QString errorMessage);
 
@@ -21,14 +41,29 @@ public slots:
     void checkUpdate();
 
 private:
+    enum class FileArch
+    {
+        unknown,
+        i386,
+        amd64,
+        arm
+    };
+
     struct FileInfo
     {
         QString name;
         QString link;
+        bool hasVersion;
+        VersionNumber version;
+        FileArch arch;
     };
 
     QNetworkAccessManager nam;
-    bool parseData(const QJsonDocument& data, QList<FileInfo>& files);
+    /// Parses json and creates a list of files
+    bool parseData(const QJsonDocument& data, QList<FileInfo>& files) const;
+    /// Finds the update file in the file list. Returns `-1` if no new version
+    /// is found.
+    bool findUpdate(const QList<FileInfo>& files, FileInfo& foundFile) const;
 
 private slots:
     void onReqFinished(QNetworkReply* reply);