A new version of ArcGIS Enterprise Cloud Builder for Microsoft Azure is available with each ArcGIS release. An image that contains the latest version of ArcGIS software is also available at each release. The image and ArcGIS Enterprise Cloud Builder for Microsoft Azure versions you use must match. For example, to deploy ArcGIS Enterprise using 10.8.1 images, you must use the 10.8.1 version of ArcGIS Enterprise Cloud Builder for Microsoft Azure. Similarly, to deploy from 10.4.1 images, you must use the 10.4.1 version of ArcGIS Enterprise Cloud Builder for Microsoft Azure. You can have different versions of ArcGIS Enterprise Cloud Builder for Microsoft Azure on the same machine, allowing you to manage version-specific deployments.
Beginning with 10.6.1, you can upgrade deployments that you created with Cloud Builder. For information on what versions can be upgraded, see Upgrade deployments.
For deployments you created at 10.5.1 or earlier releases, you must upgrade the ArcGIS software just as you do on-premises installations; however, once you've upgraded the software, do not use ArcGIS Enterprise Cloud Builder for Microsoft Azure for postdeployment operations including registering databases with ArcGIS Server, installing CA-issued-certificates, and connecting to, or deleting these upgraded deployments.