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As with the installation process, alert packs cannot be installed collectively. You can either uninstall them one by one by making use of their corresponding uninstall buttons or uninstall them in bulk using the multi-select feature (see the installation process or update processes above for reference).
If you select alerts with different status (installed, uninstalled, or updatable), the bulk actions menu will show all possible actions, but each of them will affect only the alerts with the status for which the action is possible.