Are older antivirus engine module versions available for downgrade?

Overview

Customers may request to downgrade an antivirus engine module in MetaDefender Core for testing or validation purposes. However, downgrading is not supported, and older engine module versions are not maintained or distributed.

Attempting to revert to earlier versions may also introduce compatibility issues, stability concerns, and security risks, particularly when using outdated signatures.

Recommendation

For testing or validation scenarios, it is recommended to use the latest available engine version and ensure the system can successfully retrieve updates from the update server.

If short-term stability is required (for example, during troubleshooting or investigation), you can temporarily prevent updates by pinning the current engine version:

• Navigate to Inventory > Modules and confirm the engine and database version currently in use
• Go to Settings > Module Update and set updates to manual or adjust the schedule to pause updates during your maintenance window
• If using OPSWAT Central Management, ensure that central policies do not override these settings

This approach allows you to maintain a consistent environment for testing.

⚠️ This approach should only be used as a temporary workaround. Once testing or troubleshooting is complete, restore automatic updates to ensure the engine continues receiving the latest signatures and security fixes.