No, you don’t need to uninstall the older version of the CCleaner app for installing the new CCleaner Pro app on your device. One can even use the newer version over the top of the older version without having any issues. If you still are getting confused among this option and have a few worries inside, you can uninstall the older version as well. But in that case, you will not be able to get the previous settings back in any case.