MetaDefender Core v4 v4.15.1 2. Installing or Upgrading MetaDefender Core This part of the guide describes in detail the installation and upgrade process of Metadefender Core 2.1. Recommended System Requirements 2.2. Installing MetaDefender 2.3. Upgrading MetaDefender Core 2.4. MetaDefender Core Licensing 2.5. Performance and Load Estimation 2.6. Special installation options