diff --git a/README.md b/README.md
index 0a2cee7..6498ffc 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Collabora Online is a powerful LibreOffice-based online office that supports all
 - presentations (odp, pptx, ppt…)
 
 
-**Shipped version:** 21.11.0.6~ynh1
+**Shipped version:** 21.11.4.1~ynh1
 
 
 
diff --git a/README_fr.md b/README_fr.md
index 2cb5c9b..44c837f 100644
--- a/README_fr.md
+++ b/README_fr.md
@@ -23,7 +23,7 @@ Collabora Online est une suite bureautique en ligne open source basé sur LibreO
 - des tableurs (ods, xlsx, xls…)
 - présentations (odp, pptx, ppt…)
 
-**Version incluse :** 21.11.0.6~ynh1
+**Version incluse :** 21.11.4.1~ynh1
 
 
 
diff --git a/manifest.json b/manifest.json
index d7e2d1e..0cec0ce 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "LibreOffice-based online office suite with collaborative editing",
         "fr": "Suite office en ligne et collaborative, basée sur LibreOffice"
     },
-    "version": "21.11.0.6~ynh1",
+    "version": "21.11.4.1~ynh1",
     "url": "https://collaboraoffice.com",
     "upstream": {
         "license": "MPL-2.0",
diff --git a/scripts/restore b/scripts/restore
index 5bf710d..dbf3f14 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -30,14 +30,6 @@ app=$YNH_APP_INSTANCE_NAME
 domain=$(ynh_app_setting_get --app=$app --key=domain)
 path_url=$(ynh_app_setting_get --app=$app --key=path)
 
-#=================================================
-# CHECK IF THE APP CAN BE RESTORED
-#=================================================
-ynh_script_progression --message="Validating restoration parameters..." --weight=1
-
-ynh_webpath_available --domain=$domain --path_url=$path_url \
-	|| ynh_die --message="Path not available: ${domain}${path_url}"
-
 #=================================================
 # STANDARD RESTORATION STEPS
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 48e752b..78a4120 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -27,6 +27,11 @@ nextcloud_domain=$(ynh_app_setting_get --app="$app" --key=nextcloud_domain)
 #=================================================
 ynh_script_progression --message="Ensuring downward compatibility..." --weight=2
 
+if ynh_compare_current_package_version --comparison le --version 6.4.10~ynh2
+then
+	ynh_die --message="Upgrade from version 6.4.10 is not possible. You must uninstall and reinstall Collabora package manually"
+fi
+
 # If db_name doesn't exist, create it
 if [ -z "$path_url" ]; then
 	path_url="/"