Yes MetaDefender Core upgrades are free. Your MetaDefender Core license lets you run the latest version of the product. In fact, OPSWAT recommends that you upgrade to the latest release as soon as possible so that you can benefit from new AV engine versions, new features, and bug fixes.
If you are interested in upgrading, please check our Release Notes and our Installation and Upgrade Guide, which can be found here.
If you are upgrading from MetaDefender Core v3.x to MetaDefender Core v4.x, refer to the following articles:
This article applies to MetaDefender Core v3
This article was last updated on 2019-06-21