Processing Change Only Updates for OS MasterMap Topography layer

We have found a problem when applying Change Only Updates (COUs) to OS MasterMap Topography layer using UK Data Loader 4.2.1 with older versions of ArcGIS Pro. We recommend that before applying COUs using UK Data Loader 4.2.1, you first check that your version of ArcGIS Pro is 2.5 or above.

Due to changes in the underlying workbench elements, the COUs can only be applied by the UK Data Loader 4.2.1 if you are using ArcGIS Pro 2.5 or above. To check this please open ArcGIS Pro and go to Settings > About. If your ArcGIS Pro is not Version 2.5 or later, then please use Download Now to automatically update it. If you need to update it manually instead, please remember to also update Data Interoperability for ArcGIS Pro to the same version.