Resolve #3458897 "Release 6.4.1"

Closes #3458897

deployments/cfn/nested/cloud_orchestrator_full.yaml

@@ -699,11 +699,12 @@ Parameters:
       - UTC
   CloudOrchestratorVersion:
     Description: Version of the Cloud Orchestrator to install.
-    Default: 7.4.0
+    Default: 6.4.1
     Type: String
     AllowedValues:
       - 5.9.0
-      - 7.4.0
+      - 6.4.1
+      - 7.0.0
       - 7.x-dev
   CacheNodeType:
     Description: >-