Well, I can now see that you still have the old version of Cleanup which does not include the Rescue Center feature.
However if you would like to have it and also be able to explore the rest of the new features which are in the new Cleanup and you don't want to wait for the automatic upgrade you can do it on your own by simply downloading the installation package and executing it. The rest shall be seamless so you should end up with a new version of Cleanup on your computer utilizing the same license you had before.
Here is the page where you can download the installation package:
https://www.avast.com/download-softwareIn case you would have additional questions, feel free to ask.
Thanks & Regards,
Avast Cleanup team!