To delete an add-on, you uninstall the NuGet package, containing the add-on. You use the Package Management Console of Visual Studio in the following way:
RESULT: When Sitefinity CMS starts, it detects the missing add-on and removes all changes introduced by it, including all content, custom fields, modules, configurations, widget templates, etc.
To transfer the changes to the next environment from the Continuous delivery process, you transfer the ~\App_Data\Sitefinity\Addons folder to the next environments. This folder contains all installed add-ons and a registry for them - addons_registry.sf.
IMPORTANT: Always deploy the registry file as well. If the registry file is not deployed, when Sitefinity starts in the next environment it will try to automatically generate a new registry based on the existing add-ons. This will lead to mismatch of the Development environment registry and the next environment registry. As a result, the deletion of an add-on will not be deployed.
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