1. upgrade license server to the latest release 2. Upgrade first DC to the latest release 3. install and configure controller on a new VM and join in to the pool 4. upgrade VDA agent on the golden image and update entire VDAs through MCS 5. upgrade SF into the latest 6. Upgrade NS into the latest firmware [login to view URL] Citrix health check and fix the discover issues accordingly (based on Citrix best practices)