This hotfix includes new functionality, addresses customer reported issues and crashes, and contains the fixes included in previous Revit 2019 updates and fixes. With this install the following will be updated: Revit 2019, Collaboration for Revit 2019, Dynamo Core, and Dynamo Revit. Consult the release notes for areas improved and issues addressed by this update, which can be applied to Autodesk Revit 2019 running on all supported operating systems and languages. After this update is applied successfully, the build number specified in the Help > About dialog will be 19.2.10.7.

https://up.autodesk.com/2019/RVT/Autodesk_Revit_2019_2_1_Readme.html