There is no need to add Rule-Application instance.
You can add the PegaECS-Upgrade-Utilities:07-10 to your app ruleset stack and then access all the tools via ECS Upgrade Utilities landing page
Its available in
Designer Studio > System > Settings > ECS Upgrade Utilities
Please note that these tools are community tools and are not officially supported by Pega. Having said that, we are always fixing bugs and working towards a new release with some additional reports/utilities and some bug fixes. It would be great if you can provide your feedbacks,suggestions and issues in Pega Upgrade Center forums