diff --git a/manifest.json b/manifest.json
index 7be127b..c31bad3 100644
--- a/manifest.json
+++ b/manifest.json
@@ -2,6 +2,9 @@
     "name": "WordPress MultiSite",
     "id": "wordpressms",
     "packaging_format": 1,
+    "requirements": {
+        "yunohost": ">= 2.4"
+    },
     "description": {
         "en": "Create a beautiful blog or website easily",
         "fr": "Logiciel de création de blog ou de site Web"
@@ -65,7 +68,7 @@
                 "default": "No"
             },
             {
-                "name": "public_site",
+                "name": "is_public",
                 "ask": {
                     "en": "Is it a public WordPress site ?",
                     "fr": "Est-ce un site public ?"
diff --git a/manifest2.2.json b/manifest2.2.json
new file mode 100644
index 0000000..d0d714e
--- /dev/null
+++ b/manifest2.2.json
@@ -0,0 +1,77 @@
+{
+    "name": "WordPress MultiSite",
+    "id": "wordpressms",
+    "packaging_format": 1,
+    "description": {
+        "en": "Create a beautiful blog or website easily",
+        "fr": "Logiciel de création de blog ou de site Web"
+    },
+	"version": "4.4",
+	"url": "https://wordpress.org/",
+    "licence": "free",
+    "maintainer": {
+        "name": "Maniack Crudelis",
+        "email": "maniackc_dev@crudelis.fr"
+    },
+    "multi_instance": "true",
+    "services": [
+        "nginx",
+        "php5-fpm",
+        "mysql"
+    ],
+    "arguments": {
+        "install" : [
+            {
+                "name": "domain",
+                "ask": {
+                    "en": "Choose a domain for WordPress",
+                    "fr": "Choisissez un domaine pour WordPress"
+                },
+                "example": "domain.org"
+            },
+            {
+                "name": "path",
+                "ask": {
+                    "en": "Choose a path for WordPress",
+                    "fr": "Choisissez un chemin pour WordPress"
+                },
+                "example": "/blog",
+                "default": "/blog"
+            },
+            {
+                "name": "admin",
+                "ask": {
+                    "en": "Choose the WordPress administrator (must be an existing YunoHost user)",
+                    "fr": "Administrateur du site (doit être un utilisateur YunoHost existant)"
+                },
+                "example": "homer"
+            },
+            {
+                "name": "language",
+                "ask": {
+                    "en": "Choose the language of the WordPress site",
+                    "fr": "Choissisez la langue du WordPress"
+                },
+                "choices": ["en_EN", "fr_FR"],
+                "default": "en_EN"
+            },
+            {
+                "name": "multisite",
+                "ask": {
+                    "en": "Enable multisite option ?",
+                    "fr": "Activer l'option multisite ?"
+                },
+                "choices": ["Yes", "No"],
+                "default": "No"
+            },
+            {
+                "name": "is_public",
+                "ask": {
+                    "en": "Is it a public WordPress site ?",
+                    "fr": "Est-ce un site public ?"
+                },
+                "choices": ["Yes", "No"]
+            }
+        ]
+    }
+}
diff --git a/scripts/backup b/scripts/backup
index 78a0afc..43f5c40 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -1,7 +1,12 @@
 #!/bin/bash
 
 # Récupère les infos de l'application.
-app=wordpressms
+ynh_version=$(sudo yunohost -v | grep "moulinette:" | cut -d' ' -f2 | cut -d'.' -f1,2)
+if [ $ynh_version = "2.4" ]; then
+	app=$YNH_APP_INSTANCE_NAME
+else
+	app=wordpressms
+fi
 final_path=$(sudo yunohost app setting $app final_path)
 domain=$(sudo yunohost app setting $app domain)
 
diff --git a/scripts/install b/scripts/install
index d99097d..0e4dc99 100644
--- a/scripts/install
+++ b/scripts/install
@@ -1,19 +1,59 @@
 #!/bin/bash
 
-# Renseigne les variables à partir des arguments.
-domain=$1
-path=$2
-admin_wordpress=$3
-language=$4
-multisite=$5
-is_public=$6
-app=wordpressms
+ynh_version=$(sudo yunohost -v | grep "moulinette:" | cut -d' ' -f2 | cut -d'.' -f1,2)
+# Retrieve arguments
+if [ $ynh_version = "2.4" ]
+then
+	domain=$YNH_APP_ARG_DOMAIN
+	path=$YNH_APP_ARG_PATH
+	admin_wordpress=$YNH_APP_ARG_ADMIN
+	language=$YNH_APP_ARG_LANGUAGE
+	multisite=$YNH_APP_ARG_MULTISITE
+	is_public=$YNH_APP_ARG_IS_PUBLIC
+
+	app=$YNH_APP_INSTANCE_NAME
+
+	# Source app helpers
+	. /usr/share/yunohost/helpers
+else
+	domain=$1
+	path=$2
+	admin_wordpress=$3
+	language=$4
+	multisite=$5
+	is_public=$6
+	app=wordpressms
+fi
+
+
+# Delete files and db if exit with an error
+EXIT_PROPERLY () {
+	trap '' ERR
+	echo -e "\e[91m \e[1m"	# Shell in light red bold
+	echo -e "!!\n  $app install's script has encountered an error. Installation was cancelled.\n!!"
+
+	if [ $ynh_version = "2.2" ]; then
+		/bin/bash ./remove	# Appel le script remove. En 2.2, ce comportement n'est pas automatique.
+	fi
+	exit 1
+}
+TRAP_ON () {	# Activate signal capture
+	trap EXIT_PROPERLY ERR	# Capturing exit signals on error
+}
+TRAP_OFF () {	# Ignoring signal capture until TRAP_ON
+# Pour une raison que j'ignore, la fonction TRAP_ON fonctionne très bien.
+# Mais pas la fonction TRAP_OFF...
+# Utiliser directement `trap '' ERR` dans le code pour l'utiliser, à la place de la fonction.
+	trap '' ERR	# Ignoring exit signals
+}
+TRAP_ON
+
 
 # Vérifie la validité de l'user admin
 sudo yunohost user list --json | grep -q "\"username\": \"$admin_wordpress\""
 if [[ ! $? -eq 0 ]]; then
     echo "Wrong admin"
-    exit 1
+    touch /force_stop
 fi
 
 # Vérifie la présence du / en début de path
@@ -24,7 +64,7 @@ fi
 # Vérifie la disponibilité du path et du domaine.
 sudo yunohost app checkurl $domain$path -a $app
 if [[ ! $? -eq 0 ]]; then
-    exit 1
+    touch /force_stop
 fi
 
 # Vérifie que le dossier de destination n'est pas déjà utilisé.
@@ -32,7 +72,7 @@ final_path=/var/www/$app
 if [ -e "$final_path" ]
 then
     echo "This path already contains a folder"
-    exit 1
+    touch /force_stop
 fi
 
 
@@ -46,11 +86,15 @@ sudo yunohost app setting $app multisite -v $multisite
 
 
 # Génère un mot de passe aléatoire.
-db_pwd=$(cat /dev/urandom | head -n20 | tr -c -d 'A-Za-z0-9' | head -c20)
+db_pwd=$(head -n20 /dev/urandom | tr -c -d 'A-Za-z0-9' | head -c20)
 # Utilise '$app' comme nom d'utilisateur et de base de donnée
 db_user=$app
 # Initialise la base de donnée et stocke le mot de passe mysql.
-sudo yunohost app initdb $db_user -p $db_pwd
+if [ $ynh_version = "2.4" ]; then
+	ynh_mysql_create_db $db_user $db_user $db_pwd
+else
+	sudo yunohost app initdb $db_user -p $db_pwd
+fi
 sudo yunohost app setting $app mysqlpwd -v $db_pwd
 
 
diff --git a/scripts/remove b/scripts/remove
index 686613d..9989f5d 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -1,27 +1,56 @@
 #!/bin/bash
 
-app=wordpressms
-
 # Récupère les infos de l'application.
-root_pwd=$(sudo cat /etc/yunohost/mysql)
+ynh_version=$(sudo yunohost -v | grep "moulinette:" | cut -d' ' -f2 | cut -d'.' -f1,2)
+if [ $ynh_version = "2.4" ]; then
+	app=$YNH_APP_INSTANCE_NAME
+
+	# Source app helpers
+	. /usr/share/yunohost/helpers
+else
+	app=wordpressms
+	MYSQL_ROOT_PWD_FILE="/etc/yunohost/mysql"
+fi
 domain=$(sudo yunohost app setting $app domain)
 
+# Suppression de la base de donnée et de l'utilisateur associé.
 # Utilise '$app' comme nom d'utilisateur et de base de donnée
 db_user=$app
-mysql -u root -p$root_pwd -e "DROP DATABASE $db_user ; DROP USER $db_user@localhost ;"
+if mysqlshow -u root -p$(sudo cat $MYSQL_ROOT_PWD_FILE) | grep -q "^| $db_user"; then
+	echo "Delete db"
+	if [ $ynh_version = "2.4" ]; then
+		ynh_mysql_drop_db $db_user
+		ynh_mysql_drop_user $db_user
+	else
+		mysql -u root -p$(sudo cat $MYSQL_ROOT_PWD_FILE) -e "DROP DATABASE $db_user ; DROP USER $db_user@localhost ;"
+	fi
+fi
 
 # Suppression du dossier de l'application
-sudo rm -rf /var/www/$app
+if [ -e "/var/www/$app" ]; then	# Delete final_path
+	echo "Delete app dir"
+	sudo rm -r "/var/www/$app"
+fi
 
 # Suppression de la configuration nginx
-sudo rm -f /etc/nginx/conf.d/$domain.d/$app.conf
+if [ -e "/etc/nginx/conf.d/$domain.d/$app.conf" ]; then	# Delete nginx config
+	echo "Delete nginx config"
+	sudo rm "/etc/nginx/conf.d/$domain.d/$app.conf"
+	sudo service nginx reload
+fi
 
 # Suppression de la configuration du pool php-fpm
-sudo rm -f /etc/php5/fpm/pool.d/$app.conf
-sudo rm -f /etc/php5/fpm/conf.d/20-$app.ini
-
-# Recharge la configuration Nginx et php5-fpm
-sudo service nginx reload
+if [ -e "/etc/php5/fpm/pool.d/$app.conf" ]; then	# Delete fpm config
+	echo "Delete fpm config"
+	sudo rm "/etc/php5/fpm/pool.d/$app.conf"
+fi
+if [ -e "/etc/php5/fpm/conf.d/20-$app.ini" ]; then	# Delete php config
+	echo "Delete php config"
+	sudo rm "/etc/php5/fpm/conf.d/20-$app.ini"
+fi
 sudo service php5-fpm reload
+
 # Régénère la configuration de SSOwat
 sudo yunohost app ssowatconf
+
+echo -e "\e[0m"	# Restore normal color
diff --git a/scripts/restore b/scripts/restore
index 4cd2174..1d97650 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -1,7 +1,12 @@
 #!/bin/bash
 
 # Récupère les infos de l'application.
-app=wordpressms
+ynh_version=$(sudo yunohost -v | grep "moulinette:" | cut -d' ' -f2 | cut -d'.' -f1,2)
+if [ $ynh_version = "2.4" ]; then
+	app=$YNH_APP_INSTANCE_NAME
+else
+	app=wordpressms
+fi
 final_path=$(sudo yunohost app setting $app final_path)
 domain=$(sudo yunohost app setting $app domain)
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 0370aac..4c6ae29 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,11 +1,14 @@
 #!/bin/bash
 
 # Récupère les infos de l'application.
-app=app_name
+ynh_version=$(sudo yunohost -v | grep "moulinette:" | cut -d' ' -f2 | cut -d'.' -f1,2)
+if [ $ynh_version = "2.4" ]; then
+	app=$YNH_APP_INSTANCE_NAME
+else
+	app=wordpressms
+fi
 domain=$(sudo yunohost app setting $app domain)
 path=$(sudo yunohost app setting $app path)
-admin_wordpress=$(sudo yunohost app setting $app admin)
-language=$(sudo yunohost app setting $app language)
 is_public=$(sudo yunohost app setting $app is_public)
 multisite=$(sudo yunohost app setting $app multisite)
 final_path=$(sudo yunohost app setting $app final_path)