Revit Updates and Hotfixes can be added to an existing deployment image from the Deployment section within Autodesk Account.
Example: Add Revit 2021.1.1 Hotfix to a Revit 2021.1 deployment image named Revit2021-custom located at D:\deploy\Revit2021 .
From the Deployment section in Autodesk Account, Add Revit in the same manner as the original Revit2021-custom deployment image.
Customize Revit and click Specific version, select Revit 2021.1.1 Hotfix for Revit 2021.
Apply the Customizations and Extensions in the same manner as the original Revit2021-custom deployment image.
Click Next to move to the Enter Settings step.
Specify the Deployment name and Deployment image path to reflect the original deployment.
Click Next to move to the Create and download step.
Agree to Terms of Use and Click Create.
Run the Deployment download application.
The Autodesk Deployment application will verify if a deployment image exists within D:\deploy\Revit2021 and once detected you will be prompted to either Update the existing deployment or Save in new location. When prompted, choose Update and click Download & update.
Depending upon the amount of difference between the original deployment image and the new deployment configuration, the changes to the deployment image may take a few minutes.
Note: You can confirm that the Revit 2021.1.1 Hotfix was included in the deployment image by looking at the contents of the setup_ext.xml located in D:\deploy\Revit2021\image\<GUID>\ for reference to Revit 2021.1.1 Hotfix for Revit 2021.
WARNING: Any manual changes made to the original deployment image will be lost when the Update is applied to the existing deployment image.