diff --git a/conf/systemd.service b/conf/systemd.service
index 3766f3f..70c6294 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -1,12 +1,14 @@
 [Unit]
-Description=Run Ethercalc, the collaborative spreadsheet editor.
+Description=Ethercalc, the collaborative spreadsheet editor.
 After=network.target
 
 [Service]
 Type=simple
 User=__APP__
 Group=__APP__
-ExecStart=/opt/node_n/n/versions/node/__NODE_VERSION__/bin/ethercalc --port __PORT__ --expire __EXPIRE__
+Environment="NODE_ENV=production"
+Environment="__YNH_NODE_LOAD_PATH__"
+ExecStart=/usr/bin/ethercalc --port __PORT__ --expire __EXPIRE__
 EnvironmentFile=/etc/systemd/system/ethercalc.env
 RuntimeMaxSec=86400
 Restart=always
diff --git a/manifest.json b/manifest.json
index 58fb394..cc2362b 100644
--- a/manifest.json
+++ b/manifest.json
@@ -2,11 +2,12 @@
     "name": "EtherCalc",
     "id": "ethercalc",
     "packaging_format": 1,
-    "version": "0.20170704.0~ynh1",
     "description": {
         "en": "Online web spreadsheet editor providing collaborative editing in really real-time",
         "fr": "Feuille de calcul collaborative en ligne"
     },
+    "version": "0.20170704.0~ynh1",
+    "url": "https://ethercalc.net/",
     "license": "CPAL-1.0&Artistic-2.0",
     "maintainer": {
         "name": "ljf",
@@ -14,9 +15,8 @@
         "url": "https://reflexlibre.net"
     },
     "multi_instance": true,
-    "url": "https://ethercalc.net/",
     "requirements": {
-        "yunohost": ">= 2.7.2"
+        "yunohost": ">= 4.0.0"
     },
     "services": [
         "nginx",
@@ -50,8 +50,6 @@
                 },
                 "default": "0"
             }
-
-
         ]
     }
 }
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 7c0c3d4..6f3384f 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -6,223 +6,8 @@
 
 pkg_dependencies="redis-server"
 
-node_version="4.8.7"
+nodejs_version=12
 
 # =============================================================================
 #                     YUNOHOST 2.7 FORTHCOMING HELPERS
 # =============================================================================
-
-# Create a dedicated nginx config
-#
-# usage: ynh_add_nginx_config
-ynh_add_nginx_config () {
-	finalnginxconf="/etc/nginx/conf.d/$domain.d/$app.conf"
-	ynh_backup_if_checksum_is_different "$finalnginxconf"
-	sudo cp ../conf/nginx.conf "$finalnginxconf"
-
-	# To avoid a break by set -u, use a void substitution ${var:-}. If the variable is not set, it's simply set with an empty variable.
-	# Substitute in a nginx config file only if the variable is not empty
-	if test -n "${path_url:-}"; then
-		ynh_replace_string "__PATH__" "$path_url" "$finalnginxconf"
-	fi
-	if test -n "${domain:-}"; then
-		ynh_replace_string "__DOMAIN__" "$domain" "$finalnginxconf"
-	fi
-	if test -n "${port:-}"; then
-		ynh_replace_string "__PORT__" "$port" "$finalnginxconf"
-	fi
-	if test -n "${app:-}"; then
-		ynh_replace_string "__NAME__" "$app" "$finalnginxconf"
-	fi
-	if test -n "${final_path:-}"; then
-		ynh_replace_string "__FINALPATH__" "$final_path" "$finalnginxconf"
-	fi
-	ynh_store_file_checksum "$finalnginxconf"
-
-	sudo systemctl reload nginx
-}
-
-# Remove the dedicated nginx config
-#
-# usage: ynh_remove_nginx_config
-ynh_remove_nginx_config () {
-	ynh_secure_remove "/etc/nginx/conf.d/$domain.d/$app.conf"
-	sudo systemctl reload nginx
-}
-
-# Create a dedicated php-fpm config
-#
-# usage: ynh_add_fpm_config
-ynh_add_fpm_config () {
-	finalphpconf="/etc/php5/fpm/pool.d/$app.conf"
-	ynh_backup_if_checksum_is_different "$finalphpconf"
-	sudo cp ../conf/php-fpm.conf "$finalphpconf"
-	ynh_replace_string "__NAMETOCHANGE__" "$app" "$finalphpconf"
-	ynh_replace_string "__FINALPATH__" "$final_path" "$finalphpconf"
-	ynh_replace_string "__USER__" "$app" "$finalphpconf"
-	sudo chown root: "$finalphpconf"
-	ynh_store_file_checksum "$finalphpconf"
-
-	if [ -e "../conf/php-fpm.ini" ]
-	then
-		finalphpini="/etc/php5/fpm/conf.d/20-$app.ini"
-		ynh_backup_if_checksum_is_different "$finalphpini"
-		sudo cp ../conf/php-fpm.ini "$finalphpini"
-		sudo chown root: "$finalphpini"
-		ynh_store_file_checksum "$finalphpini"
-	fi
-
-	sudo systemctl reload php5-fpm
-}
-
-# Remove the dedicated php-fpm config
-#
-# usage: ynh_remove_fpm_config
-ynh_remove_fpm_config () {
-	ynh_secure_remove "/etc/php5/fpm/pool.d/$app.conf"
-	ynh_secure_remove "/etc/php5/fpm/conf.d/20-$app.ini" 2>&1
-	sudo systemctl reload php5-fpm
-}
-
-# Create a dedicated systemd config
-#
-# usage: ynh_add_systemd_config
-ynh_add_systemd_config () {
-	finalsystemdconf="/etc/systemd/system/$app.service"
-	ynh_backup_if_checksum_is_different "$finalsystemdconf"
-	sudo cp ../conf/systemd.service "$finalsystemdconf"
-
-	# To avoid a break by set -u, use a void substitution ${var:-}. If the variable is not set, it's simply set with an empty variable.
-	# Substitute in a nginx config file only if the variable is not empty
-	if test -n "${final_path:-}"; then
-		ynh_replace_string "__FINALPATH__" "$final_path" "$finalsystemdconf"
-	fi
-	if test -n "${app:-}"; then
-		ynh_replace_string "__APP__" "$app" "$finalsystemdconf"
-	fi
-	ynh_store_file_checksum "$finalsystemdconf"
-
-	sudo chown root: "$finalsystemdconf"
-	sudo systemctl enable $app
-	sudo systemctl daemon-reload
-}
-
-# Remove the dedicated systemd config
-#
-# usage: ynh_remove_systemd_config
-ynh_remove_systemd_config () {
-	finalsystemdconf="/etc/systemd/system/$app.service"
-	if [ -e "$finalsystemdconf" ]; then
-		sudo systemctl stop $app
-		sudo systemctl disable $app
-		ynh_secure_remove "$finalsystemdconf"
-	fi
-}
-#=================================================
-# NODEJS
-#=================================================
-
-sudo_path () {
-	sudo env "PATH=$PATH" $@
-}
-
-# INFOS
-# n (Node version management) utilise la variable PATH pour stocker le path de la version de node à utiliser.
-# C'est ainsi qu'il change de version
-# En attendant une généralisation de root, il est possible d'utiliser sudo avec le helper temporaire sudo_path
-# Il permet d'utiliser sudo en gardant le $PATH modifié
-# ynh_install_nodejs installe la version de nodejs demandée en argument, avec n
-# ynh_use_nodejs active une version de nodejs dans le script courant
-# 3 variables sont mises à disposition, et 2 sont stockées dans la config de l'app
-# - nodejs_path: Le chemin absolu de cette version de node
-# Utilisé pour des appels directs à node.
-# - nodejs_version: Simplement le numéro de version de nodejs pour cette application
-# - nodejs_use_version: Un alias pour charger une version de node dans le shell courant.
-# Utilisé pour démarrer un service ou un script qui utilise node ou npm
-# Dans ce cas, c'est $PATH qui contient le chemin de la version de node. Il doit être propagé sur les autres shell si nécessaire.
-
-n_install_dir="/opt/node_n"
-ynh_use_nodejs () {
-	nodejs_version=$(ynh_app_setting_get $app nodejs_version)
-
-	load_n_path="[[ :$PATH: == *\":$n_install_dir/bin:\"* ]] || PATH=\"$n_install_dir/bin:$PATH\""
-
-	nodejs_use_version="n $nodejs_version"
-
-	# "Load" a version of node
-	eval $load_n_path; $nodejs_use_version
-	eval $load_n_path; sudo env "PATH=$PATH" $nodejs_use_version
-
-	# Get the absolute path of this version of node
-	nodejs_path="$(n bin $nodejs_version)"
-
-	# Make an alias for node use
-	ynh_node_exec="eval $load_n_path; n use $nodejs_version"
-	sudo_ynh_node_exec="eval $load_n_path; sudo env \"PATH=$PATH\" n use $nodejs_version"
-}
-
-ynh_install_nodejs () {
-	# Use n, https://github.com/tj/n to manage the nodejs versions
-	local nodejs_version="$1"
-	local n_install_script="https://git.io/n-install"
-
-	# Create $n_install_dir
-	sudo mkdir -p "$n_install_dir"
-
-	# Load n path in PATH
-	CLEAR_PATH="$n_install_dir/bin:$PATH"
-	# Remove /usr/local/bin in PATH in case of node has already setup.
-	PATH=$(echo $CLEAR_PATH | sed 's@/usr/local/bin:@@')
-
-	# Move an existing node binary, to avoid to block n.
-	test -x /usr/bin/node && sudo mv /usr/bin/node /usr/bin/node_n
-	test -x /usr/bin/npm && sudo mv /usr/bin/npm /usr/bin/npm_n
-
-	# If n is not previously setup, install it
-	n --version > /dev/null 2>&1 || \
-	( echo "Installation of N - Node.js version management" >&2; \
-	curl -sL $n_install_script | sudo env "PATH=$PATH" N_PREFIX="$n_install_dir" bash -s -- -y $nodejs_version )
-
-	# Restore /usr/local/bin in PATH
-	PATH=$CLEAR_PATH
-
-	# And replace the old node binary.
-	test -x /usr/bin/node_n && sudo mv /usr/bin/node_n /usr/bin/node
-	test -x /usr/bin/npm_n && sudo mv /usr/bin/npm_n /usr/bin/npm
-
-	# Install the requested version of nodejs (except for the first installation of n, which installed the requested version of node.)
-	sudo env "PATH=$PATH" n $nodejs_version
-
-	# Use the real installed version. Sometimes slightly different
-	nodejs_version=$(node --version | cut -c2-)
-
-	# Store the ID of this app and the version of node requested for it
-	echo "$YNH_APP_ID:$nodejs_version" | sudo tee --append "$n_install_dir/ynh_app_version"
-
-	# Store nodejs_version into the config of this app
-	ynh_app_setting_set $app nodejs_version $nodejs_version
-
-	ynh_use_nodejs
-}
-
-ynh_remove_nodejs () {
-	ynh_use_nodejs
-
-	# Remove the line for this app
-	sudo sed --in-place "/$YNH_APP_ID:$nodejs_version/d" "$n_install_dir/ynh_app_version"
-
-	# If none another app uses this version of nodejs, remove it.
-	if ! grep --quiet "$nodejs_version" "$n_install_dir/ynh_app_version"
-	then
-		n rm $nodejs_version
-	fi
-
-	# If none another app uses n, remove n
-	if [ ! -s "$n_install_dir/ynh_app_version" ]
-	then
-		ynh_secure_remove "$n_install_dir"
-		sudo sed --in-place "/N_PREFIX/d" /root/.bashrc
-	fi
-}
-
-
diff --git a/scripts/install b/scripts/install
index ec99121..e7bed57 100644
--- a/scripts/install
+++ b/scripts/install
@@ -29,74 +29,83 @@ app=$YNH_APP_INSTANCE_NAME
 #=================================================
 # CHECK IF THE APP CAN BE INSTALLED WITH THESE ARGS
 #=================================================
-
-ynh_webpath_available $domain $path_url
-ynh_webpath_register $app $domain $path_url
+ynh_script_progression --message="Validating installation parameters..." --time --weight=1
 
 final_path=/var/www/$app
-test ! -e "$final_path" || ynh_die "This path already contains a folder"
+test ! -e "$final_path" || ynh_die --message="This path already contains a folder"
+
+# Register (book) web path
+ynh_webpath_register --app=$app --domain=$domain --path_url=$path_url
 
 #=================================================
 # STORE SETTINGS FROM MANIFEST
 #=================================================
 
-ynh_app_setting_set $app domain $domain
-ynh_app_setting_set $app is_public $is_public
-ynh_app_setting_set $app expire $expire
+ynh_app_setting_set --app=$app --key=domain --value=$domain
+ynh_app_setting_set --app=$app --key=path --value=$path_url
+ynh_app_setting_set --app=$app --key=admin --value=$admin
+ynh_app_setting_set --app=$app --key=is_public --value=$is_public
+ynh_app_setting_set --app=$app --key=expire --value=$expire
 
 #=================================================
 # STANDARD MODIFICATIONS
 #=================================================
 # FIND AND OPEN A PORT
 #=================================================
+ynh_script_progression --message="Configuring firewall..." --time --weight=1
 
-port=$(ynh_find_port 8095)
-sudo yunohost firewall allow --no-upnp TCP $port 2>&1
-ynh_app_setting_set $app port $port
-
-#=================================================
-# INSTALL NODEJS
-#=================================================
-
-ynh_install_nodejs $node_version
-
-ynh_app_setting_set $app node_version $node_version
+port=$(ynh_find_port --port=8095)
+ynh_app_setting_set --app=$app --key=port --value=$port
 
 #=================================================
 # INSTALL DEPENDENCIES
 #=================================================
+ynh_script_progression --message="Installing dependencies..." --weight=20
 
 ynh_install_app_dependencies $pkg_dependencies
 
+# Install Nodejs
+ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
+
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
+ynh_script_progression --message="Setting up source files..." --weight=2
 
-ynh_app_setting_set $app final_path $final_path
+ynh_app_setting_set --app=$app --key=final_path --value=$final_path
+# Download, check integrity, uncompress and patch the source from app.src
+ynh_setup_source --dest_dir=$final_path
 
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
+ynh_script_progression --message="Configuring NGINX web server..." --weight=2
 
+# Create a dedicated NGINX config
 ynh_add_nginx_config
 
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
+ynh_script_progression --message="Configuring system user..." --weight=3
 
-ynh_system_user_create $app
+# Create a system user
+ynh_system_user_create --username=$app --home_dir=$final_path
 
 #=================================================
 # INSTALL ETHERCALC
 #=================================================
+ynh_script_progression --message="Building CodiMD... (this will take some time and resources!)" --weight=240
 
-ynh_use_nodejs
-
-npm install -g ethercalc
+pushd "$final_path" || ynh_die
+	ynh_use_nodejs
+	ynh_exec_warn_less npm install -g ethercalc
+popd || ynh_die
 
 #=================================================
 # SETUP SYSTEMD BASED SERVICES
 #=================================================
+ynh_script_progression --message="Configuring a systemd service..." --weight=1
 
 ynh_add_systemd_config
 
@@ -133,19 +142,25 @@ sudo yunohost service add $app --log "/var/log/ethercalc.log"
 #=================================================
 # SETUP SSOWAT
 #=================================================
+ynh_script_progression --message="Configuring SSOwat..." --weight=1
 
-if [ $is_public -eq 0 ]
-then	
-	ynh_app_setting_delete $app skipped_uris
-fi
-
+# Make app public if necessary or protect it
 if [ $is_public -eq 1 ]
 then
-	ynh_app_setting_set $app unprotected_uris "/"
+	# Everyone can access the app.
+	# The "main" permission is automatically created before the install script.
+	 	ynh_permission_update --permission "main" --add "visitors"
 fi
 
 #=================================================
 # RELOAD NGINX
 #=================================================
+ynh_script_progression --message="Reloading NGINX web server..." --weight=2
 
 ynh_systemd_action --service_name=nginx --action=reload
+
+#=================================================
+# END OF SCRIPT
+#=================================================
+
+ynh_script_progression --message="Installation of EtherCalc completed" --last