You can upgrade Rendition Engine from version 4.5.x, 5.0 or 5.1.0 to version 5.2.0. If you are upgrading your FileNet® P8 components from version 5.2.0 to 5.2.1, you need to upgrade Rendition Engine to 5.2.0 fix pack 1.
If you are upgrading your FileNet P8 components from version 5.2.0 to 5.2.1, you do not need to upgrade Rendition Engine, which stays at version 5.2.0.