diff --git a/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp b/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp
index cf5be876c..99f1a54a8 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/configfile.cpp
@@ -25,7 +25,7 @@
 CConfigFile *CConfigFile::s_instance = NULL;
 
 CConfigFile::CConfigFile(QObject *parent):QObject(parent), m_version(-1),
-	m_defaultServerIndex(0), m_defaultProfileIndex(0), m_use64BitsClient(false), m_shouldUninstallOldClient(true)
+	m_defaultServerIndex(0), m_defaultProfileIndex(0), m_installerCopied(false), m_use64BitsClient(false), m_shouldUninstallOldClient(true)
 {
 	s_instance = this;
 
@@ -945,8 +945,8 @@ OperationStep CConfigFile::getInstallNextStep() const
 		}
 	}
 
-	// current installer more recent than installed one
-	if (compareInstallersVersion() == 1) return CopyInstaller;
+	// current installer more recent than installed one and not already copied
+	if (!m_installerCopied && compareInstallersVersion() == 1) return CopyInstaller;
 
 	// no default profile
 	if (profile.id.isEmpty())
@@ -992,7 +992,7 @@ OperationStep CConfigFile::getInstallNextStep() const
 	// current installer more recent than installed one
 	switch (compareInstallersVersion())
 	{
-		// current installer more recent, copy it
+		// current installer more recent, should be already copied
 		case 1: break;
 
 		// current installer older, launch the more recent installer
diff --git a/code/ryzom/tools/client/ryzom_installer/src/configfile.h b/code/ryzom/tools/client/ryzom_installer/src/configfile.h
index d1560c40e..df13b7a51 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/configfile.h
+++ b/code/ryzom/tools/client/ryzom_installer/src/configfile.h
@@ -57,6 +57,9 @@ public:
 
 	QString getLanguage() const { return m_language; }
 
+	bool getInstallerCopied() const { return m_installerCopied; }
+	void setInstallerCopied(bool copied) { m_installerCopied = copied; }
+
 	int getProfilesCount() const;
 	CProfile getProfile(int i = -1) const;
 	CProfile getProfile(const QString &id) const;
@@ -145,6 +148,7 @@ private:
 	int m_version;
 	int m_defaultServerIndex;
 	int m_defaultProfileIndex;
+	bool m_installerCopied;
 
 	CServers m_servers;
 	CProfiles m_profiles;
diff --git a/code/ryzom/tools/client/ryzom_installer/src/filescopier.cpp b/code/ryzom/tools/client/ryzom_installer/src/filescopier.cpp
index 1a8e6cfaf..8cfb3c0d5 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/filescopier.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/filescopier.cpp
@@ -194,6 +194,9 @@ bool CFilesCopier::copyFiles(const FilesToCopy &files)
 		processedSize += file.size;
 	}
 
+	// wait 1 second to be sure all files have been copied (because to disk cache)
+	QThread::sleep(1);
+
 	if (m_listener)
 	{
 		m_listener->operationSuccess(totalSize);
diff --git a/code/ryzom/tools/client/ryzom_installer/src/filesextractor.cpp b/code/ryzom/tools/client/ryzom_installer/src/filesextractor.cpp
index 241817e9c..d314dce93 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/filesextractor.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/filesextractor.cpp
@@ -462,7 +462,7 @@ bool CFilesExtractor::extract7z()
 			}
 
 			// create file
-			QFile outFile(destPath);
+			QSaveFile outFile(destPath);
 
 			if (!outFile.open(QFile::WriteOnly))
 			{
@@ -496,7 +496,7 @@ bool CFilesExtractor::extract7z()
 				break;
 			}
 
-			outFile.close();
+			outFile.commit();
 
 			totalUncompressed += uncompressedSize;
 
@@ -620,7 +620,7 @@ bool CFilesExtractor::extractZip()
 				return true;
 			}
 
-			QFile f(absPath);
+			QSaveFile f(absPath);
 
 			if (!f.open(QIODevice::WriteOnly))
 			{
@@ -637,7 +637,7 @@ bool CFilesExtractor::extractZip()
 				nlwarning("Unable to change permissions of %s", Q2C(absPath));
 			}
 
-			f.close();
+			f.commit();
 
 			// set the right modification date
 			if (!NLMISC::CFile::setFileModificationDate(qToUtf8(absPath), fi.lastModified.toTime_t()))
diff --git a/code/ryzom/tools/client/ryzom_installer/src/operationdialog.cpp b/code/ryzom/tools/client/ryzom_installer/src/operationdialog.cpp
index f9e086c16..f5dc89086 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/operationdialog.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/operationdialog.cpp
@@ -791,6 +791,9 @@ void COperationDialog::copyInstaller()
 #endif
 
 		createShortcut(shortcut, name, executable, "", icon, "");
+
+		// installer already copied, don't need to copy it again
+		config->setInstallerCopied(true);
 	}
 
 	emit done();