diff --git a/VERSION b/VERSION
deleted file mode 100644
index 8089590..0000000
--- a/VERSION
+++ /dev/null
@@ -1 +0,0 @@
-4.3.0
diff --git a/conf/app.src b/conf/app.src
new file mode 100644
index 0000000..0071b42
--- /dev/null
+++ b/conf/app.src
@@ -0,0 +1,6 @@
+SOURCE_URL=https://releases.mattermost.com/4.3.0/mattermost-4.3.0-linux-amd64.tar.gz
+SOURCE_SUM=c21eefaa87fca836e17d874296e67baf181ab5594f705090247614faae219d01
+SOURCE_SUM_PRG=sha256sum
+SOURCE_FORMAT=tar.gz
+SOURCE_IN_SUBDIR=true
+SOURCE_FILENAME=
diff --git a/scripts/install b/scripts/install
index 009a500..4da5910 100644
--- a/scripts/install
+++ b/scripts/install
@@ -72,8 +72,6 @@ root_path="$(pwd)/.."
 final_path="/var/www/$app"
 data_path="/home/yunohost.app/$app"
 logs_path="/var/log/$app"
-version=$(cat "$root_path/VERSION")
-archive_filename="mattermost-$version.tar.gz"
 
 #=================================================
 # CREATE A MYSQL DATABASE
@@ -97,16 +95,12 @@ ynh_app_setting_set mattermost smtppwd "$smtp_password"
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
 
-archive_url="https://releases.mattermost.com/${version}/mattermost-team-${version}-linux-amd64.tar.gz"
+ynh_app_setting_set "$app" final_path "$final_path"
+ynh_setup_source "$final_path"
 
-sudo mkdir -p "$final_path"
 sudo mkdir -p "$data_path"
 sudo mkdir -p "$logs_path"
 
-sudo wget --quiet --output-document "$archive_filename" "$archive_url"
-sudo tar -xvz --file "$archive_filename" --directory "$final_path" --strip-components 1
-sudo rm -f "$archive_filename"
-
 #=================================================
 # EDIT MATTERMOST CONFIG
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index a2bffbf..b09a62c 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -27,8 +27,6 @@ root_path="$(pwd)/.."
 final_path="/var/www/$app"
 data_path="/home/yunohost.app/$app"
 logs_path="/var/log/$app"
-version=$(cat "$root_path/VERSION")
-archive_filename="mattermost-$version.tar.gz"
 
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
@@ -45,20 +43,11 @@ ynh_clean_setup () {
   fi
   # Restore the backup
   ynh_restore_upgradebackup
-  # Remove the temporary archive
-  sudo rm -f "$archive_filename"
 }
 
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
-#=================================================
-# DOWNLOAD SOURCE
-#=================================================
-
-archive_url="https://releases.mattermost.com/${version}/mattermost-team-${version}-linux-amd64.tar.gz"
-sudo wget --quiet --output-document "$archive_filename" "$archive_url"
-
 #=================================================
 # STOP SERVER
 #=================================================
@@ -84,13 +73,11 @@ backup_config_file="/tmp/config.json"
 sudo cp -f "$config_file" "$backup_config_file"
 
 #=================================================
-# COPY NEW CODE
+# DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
 
-sudo rm -rf "$final_path"
-sudo mkdir -p "$final_path"
-sudo tar -xvz --file "$archive_filename" --directory "$final_path" --strip-components 1
-sudo rm -f "$archive_filename"
+ynh_app_setting_set "$app" final_path "$final_path"
+ynh_setup_source "$final_path"
 
 #=================================================
 # RESTORE CONFIGURATION FILE