diff --git a/ModsListDownloader/src/downloader/CurseUpdateManager.java b/ModsListDownloader/src/downloader/CurseUpdateManager.java
index 07f19db..a243972 100644
--- a/ModsListDownloader/src/downloader/CurseUpdateManager.java
+++ b/ModsListDownloader/src/downloader/CurseUpdateManager.java
@@ -6,14 +6,13 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
-import java.util.SortedMap;
-import java.util.TreeMap;
+import java.util.concurrent.ConcurrentHashMap;
 
 import downloader.helper.ArchiveHelper;
 import downloader.helper.SlugHelper;
 
 public class CurseUpdateManager {
-	private SortedMap<Integer, String> installedMods;
+	private ConcurrentHashMap<Integer, String> installedMods;
 	
 	public CurseUpdateManager()
 	{
@@ -27,18 +26,18 @@ public class CurseUpdateManager {
 		{
 			try {
 				ObjectInputStream ois = new ObjectInputStream(new FileInputStream(modsMapFile));
-				installedMods = (SortedMap<Integer, String>) ois.readObject();
+				installedMods = (ConcurrentHashMap<Integer, String>) ois.readObject();
 				ois.close();
 			} catch (Exception e) {
 				modsMapFile.delete();
 			}
-			if(installedMods == null)installedMods = new TreeMap<>();
 		}
+		if(installedMods == null)installedMods = new ConcurrentHashMap<>();
 		this.updateFile();
 	}
 
 	public boolean checkAndDelete(File modToDownload, int modid) {
-		String alredyInstalledName = installedMods.get(modid).toLowerCase();	
+		String alredyInstalledName = installedMods.get(modid).toLowerCase();
 		File alredyInstalledMods= null;
 		
 		//on cherche le fichier local affin de ne pas voir d'erreur avec la casse
@@ -61,7 +60,7 @@ public class CurseUpdateManager {
 
 		if (alredyInstalledMods.exists()) {
 			//we only check if the jar file still works
-			if(ArchiveHelper.checkJarIntegrity(alredyInstalledMods)) {
+			if(!ArchiveHelper.checkJarIntegrity(alredyInstalledMods)) {
 				alredyInstalledMods.delete();
 				installedMods.remove(modid);
 				updateFile();
@@ -110,18 +109,17 @@ public class CurseUpdateManager {
 	 * @param fileName
 	 * @param modID
 	 */
-	public void addModsToTheList(String fileName,int modID)
+	public synchronized void addModsToTheList(String fileName,int modID)
 	{
 		installedMods.put(modID, fileName);	
-		updateFile();
 	}
 	
-	public boolean isModIdKnown(int modId)
+	public synchronized boolean isModIdKnown(int modId)
 	{
 		return installedMods.get(modId) != null;
 	}
 	
-	private void updateFile()
+	public synchronized void updateFile()
 	{
 		File modsMap = new File("mods/modsMap.sav");
 		try {
diff --git a/ModsListDownloader/src/downloader/DatabaseVersionManager.java b/ModsListDownloader/src/downloader/DatabaseVersionManager.java
index 1bd627d..f821752 100644
--- a/ModsListDownloader/src/downloader/DatabaseVersionManager.java
+++ b/ModsListDownloader/src/downloader/DatabaseVersionManager.java
@@ -4,7 +4,9 @@ import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
+import java.io.FileWriter;
 import java.io.IOException;
+import java.io.PrintWriter;
 import java.net.MalformedURLException;
 
 import downloader.helper.ArchiveHelper;
@@ -29,11 +31,22 @@ public class DatabaseVersionManager {
         if( version == null || !latestVersion.equals(version) ) {
             Log.i(ME, "new dbVersion avaliable downloading...");
             downloadDatabase(latestVersion);
+            saveDbVersion(latestVersion);
         } else {
             Log.i(ME, "update to Date");
         }
     }
 
+    private void saveDbVersion(String latestVersion) {
+        File versionFile = new File("dbVersion");
+        PrintWriter out;
+        try {
+            out = new PrintWriter(new FileWriter(versionFile));
+            out.println(latestVersion);
+            out.close();
+        } catch (IOException e) {}
+    }
+
     private void downloadDatabase(String dbVersion) {
         Log.i(ME, "fetching=" + "http://files.mcdex.net/data/mcdex-v5-" + dbVersion + ".dat.bz2");
         File archive;
@@ -81,8 +94,7 @@ public class DatabaseVersionManager {
                 versionFile.delete();
                 return null;
             }
-        } else {
-            throw new FileNotFoundException();
         }
+        throw new FileNotFoundException();
     }
 }
diff --git a/ModsListDownloader/src/downloader/Log.java b/ModsListDownloader/src/downloader/Log.java
index 752829a..37ca65f 100644
--- a/ModsListDownloader/src/downloader/Log.java
+++ b/ModsListDownloader/src/downloader/Log.java
@@ -4,7 +4,7 @@ public class Log {
 	private Log() {}
 
 	public static void e(String who, String msg) {
-		System.err.println(String.valueOf(who) + "  :  " + msg);
+		System.out.println(String.valueOf(who) + "  :  " + msg);
 	}
 	
 	public static void i(String who, String msg) {
diff --git a/ModsListDownloader/src/downloader/ModUpdater.java b/ModsListDownloader/src/downloader/ModUpdater.java
index 0a31951..2fa82ca 100644
--- a/ModsListDownloader/src/downloader/ModUpdater.java
+++ b/ModsListDownloader/src/downloader/ModUpdater.java
@@ -51,12 +51,19 @@ public class ModUpdater {
 				}
 		    }
             in.close();
-            Log.i(ME, "finished");
-
         } catch( IOException e ) {
             e.printStackTrace();
             System.exit(1);
         }
+		
+		//on attend la fin des threads
+		while( !threads.isEmpty() ) {
+			try {
+				Thread.sleep(10);
+			} catch (InterruptedException e) {}
+		}
+		Log.i(ME, "finished");
+		curseUpdateManager.updateFile();
     }
 
     public static boolean isAComment(String line)
@@ -143,6 +150,9 @@ final class UpdaterThread extends Thread {
 				else {
 					Log.i("DB", "NEW MOD DETECTED " + modID);
 					upToDate = this.curseUpdateManager.checkAndDelete(new File("mods/" + HttpHelper.getFileNameFromURL(downloadUrl)), pj.getSlug());
+					if(upToDate) {
+						this.curseUpdateManager.addModsToTheList("mods/" + HttpHelper.getFileNameFromURL(downloadUrl), modID);
+					}
 				} 
 
 				if (!upToDate) {
diff --git a/ModsListDownloader/src/downloader/helper/HttpHelper.java b/ModsListDownloader/src/downloader/helper/HttpHelper.java
index 265c761..bbfa079 100644
--- a/ModsListDownloader/src/downloader/helper/HttpHelper.java
+++ b/ModsListDownloader/src/downloader/helper/HttpHelper.java
@@ -79,6 +79,7 @@ public class HttpHelper {
 		return readFileFromUrl(urlToFetch, new File((folder + name.toLowerCase()).trim()));
 	}
 
+	//TODO: debug
 	private static File readFileFromUrl(String urlToFetch, File destination) throws MalformedURLException {
 		URL url = new URL(urlToFetch);
 		HttpURLConnection con;