diff --git a/manifest.json b/manifest.json
index 23c337e..a9e5e4b 100644
--- a/manifest.json
+++ b/manifest.json
@@ -8,7 +8,7 @@
     },
         "version": "0.7.51~ynh1",
     "url": "https://laverna.cc/index.html",
-    "license": "free",
+    "license": "MPL-2.0",
     "maintainer": {
         "name": "Alex",
         "email": "apulido@free.fr"
diff --git a/scripts/_common.sh b/scripts/_common.sh
index e69de29..944a65e 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+#=================================================
+# COMMON VARIABLES
+#=================================================
+
+#=================================================
+# PERSONAL HELPERS
+#=================================================
+
+#=================================================
+# EXPERIMENTAL HELPERS
+#=================================================
+
+#=================================================
+# FUTURE OFFICIAL HELPERS
+#=================================================
diff --git a/scripts/backup b/scripts/backup
index 99f4abc..532eb2a 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -18,7 +18,7 @@ ynh_abort_if_errors
 #=================================================
 # LOAD SETTINGS
 #=================================================
-ynh_print_info --message="Backing up 243..."
+ynh_print_info --message="Backing up Laverna..."
 
 app=$YNH_APP_INSTANCE_NAME
 
@@ -41,4 +41,4 @@ ynh_backup --src_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 # END OF SCRIPT
 #=================================================
 
-ynh_print_info --message="Backup script completed for $app. (YunoHost will then actually copy those files to the archive)."
+ynh_print_info --message="Backup script completed for Laverna. (YunoHost will then actually copy those files to the archive)."
diff --git a/scripts/change_url b/scripts/change_url
index a5d8867..bab3080 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -1,93 +1,102 @@
 #!/bin/bash
 
 #=================================================
-# GENERIC START
+# GENERIC STARTING
 #=================================================
 # IMPORT GENERIC HELPERS
 #=================================================
 
 source /usr/share/yunohost/helpers
 
-#=================================================
-# MANAGE SCRIPT FAILURE
-#=================================================
-
-# Exit if an error occurs during the execution of the script
+# Stop script if errors
 ynh_abort_if_errors
 
 #=================================================
-# RETRIEVE ARGUMENTS FROM THE MANIFEST
+# RETRIEVE ARGUMENTS
 #=================================================
-# Retrieve arguments
 
-domain=$YNH_APP_ARG_DOMAIN
-path_url=$YNH_APP_ARG_PATH
-is_public=$YNH_APP_ARG_IS_PUBLIC
+old_domain=$YNH_APP_OLD_DOMAIN
+old_path=$YNH_APP_OLD_PATH
+
+new_domain=$YNH_APP_NEW_DOMAIN
+new_path=$YNH_APP_NEW_PATH
 
 app=$YNH_APP_INSTANCE_NAME
 
 #=================================================
-# CHECK IF THE APP CAN BE INSTALLED WITH THESE ARGS
+# LOAD SETTINGS
 #=================================================
-ynh_script_progression --message="Validating installation parameters..." --weight=1
+ynh_script_progression --message="Loading installation settings..." --weight=1
 
-# Copy files to the right place
-final_path=/var/www/$app
-test ! -e "$final_path" || ynh_die --message="This path already contains a folder"
-
-# Register (book) web path
-ynh_webpath_register --app=$app --domain=$domain --path_url=$path_url
+# Needed for helper "ynh_add_nginx_config"
+final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 
 #=================================================
-# STORE SETTINGS FROM MANIFEST
+# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
-ynh_script_progression --message="Storing installation settings..." --weight=2
+ynh_script_progression --message="Backing up Laverna before changing its URL..." --weight=2
 
-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=$app --key=is_public --value=$is_public
+# Backup the current version of the app
+ynh_backup_before_upgrade
+ynh_clean_setup () {
+	# Remove the new domain config file, the remove script won't do it as it doesn't know yet its location.
+	ynh_secure_remove --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
+
+	# restore it if the upgrade fails
+	ynh_restore_upgradebackup
+}
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
 
 #=================================================
-# STANDARD MODIFICATIONS
-#=================================================
-# DOWNLOAD, CHECK AND UNPACK SOURCE
-#=================================================
-ynh_script_progression --message="Setting up source files..." --weight=1
-
-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
-
-#=================================================
-# GENERIC FINALIZATION
-#=================================================
-# SECURE FILES AND DIRECTORIES
+# CHECK WHICH PARTS SHOULD BE CHANGED
 #=================================================
 
-# Set permissions to app files
-chown -R root: $final_path
+change_domain=0
+if [ "$old_domain" != "$new_domain" ]
+then
+	change_domain=1
+fi
+
+change_path=0
+if [ "$old_path" != "$new_path" ]
+then
+	change_path=1
+fi
 
 #=================================================
-# SETUP SSOWAT
+# MODIFY URL IN NGINX CONF
 #=================================================
-ynh_script_progression --message="Configuring SSOwat..." --weight=1
+ynh_script_progression --message="Updating NGINX web server configuration..." --weight=3
 
-# Make app public if necessary or protect it
-[ $is_public -eq 0 ] || ynh_permission_update --permission "main" --add "visitors"
+nginx_conf_path=/etc/nginx/conf.d/$old_domain.d/$app.conf
+
+# Change the path in the NGINX config file
+if [ $change_path -eq 1 ]
+then
+	# Make a backup of the original NGINX config file if modified
+	ynh_backup_if_checksum_is_different --file="$nginx_conf_path"
+	# Set global variables for NGINX helper
+	domain="$old_domain"
+	path_url="$new_path"
+	# Create a dedicated NGINX config
+	ynh_add_nginx_config
+fi
+
+# Change the domain for NGINX
+if [ $change_domain -eq 1 ]
+then
+	# Delete file checksum for the old conf file location
+	ynh_delete_file_checksum --file="$nginx_conf_path"
+	mv $nginx_conf_path /etc/nginx/conf.d/$new_domain.d/$app.conf
+	# Store file checksum for the new config file location
+	ynh_store_file_checksum --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
+fi
 
 #=================================================
 # RELOAD NGINX
 #=================================================
-ynh_script_progression --message="Reloading NGINX web server..." --weight=1
+ynh_script_progression --message="Reloading NGINX web server..." --weight=2
 
 ynh_systemd_action --service_name=nginx --action=reload
 
@@ -95,4 +104,4 @@ ynh_systemd_action --service_name=nginx --action=reload
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Installation of $app completed" --last
+ynh_script_progression --message="Change of URL completed for Laverna" --last
diff --git a/scripts/install b/scripts/install
index 5b15446..7ae0820 100755
--- a/scripts/install
+++ b/scripts/install
@@ -98,4 +98,4 @@ ynh_systemd_action --service_name=nginx --action=reload
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Installation of $app completed" --last
+ynh_script_progression --message="Installation of Laverna completed" --last
diff --git a/scripts/remove b/scripts/remove
index 2123569..28ad183 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -40,4 +40,4 @@ ynh_remove_nginx_config
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Removal of $app completed" --last
+ynh_script_progression --message="Removal of Laverna completed" --last
diff --git a/scripts/restore b/scripts/restore
index c2896b5..3f60c97 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -79,4 +79,4 @@ ynh_systemd_action --service_name=nginx --action=reload
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Restoration completed for $app" --last
+ynh_script_progression --message="Restoration completed for Laverna" --last
diff --git a/scripts/upgrade b/scripts/upgrade
index 993d052..b95b4b7 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -93,14 +93,6 @@ ynh_add_nginx_config
 # Set permissions on app files
 chown -R root: $final_path
 
-#=================================================
-# SETUP SSOWAT
-#=================================================
-ynh_script_progression --message="Upgrading SSOwat configuration..." --weight=1
-
-# Make app public if necessary or protect it
-[ $is_public -eq 0 ] || ynh_permission_update --permission "main" --add "visitors"
-
 #=================================================
 # RELOAD NGINX
 #=================================================
@@ -112,4 +104,4 @@ ynh_systemd_action --service_name=nginx --action=reload
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Upgrade of $app completed" --last
+ynh_script_progression --message="Upgrade ofLaverna completed" --last