There's always a solution for this problem, especially for programs as popular as CCleaner.
CCAuto Updater is a simple application that helps you update CCleaner more quickly and easily.
First, you need to specify CCleaner's installation folder (it's usually under Program Files).
Then, just click on the Update button to automatically download and install CCleaner's latest version.
CCAuto Updater lets you program CCleaner's updates, and add it as a startup program.