You can easily update CCleaner by using the 'Check for updates' link within the CCleaner interface. If you're using CCleaner Professional, you can enable background updates so that CCleaner updates itself automatically when there's a new version.
How to update CCleaner manually:
You can install updates by clicking on the 'Check for updates' link at the bottom right-hand corner of the CCleaner interface:
If there's a newer version available, you will be notified and given the option to download it.
CCleaner Professional Automatic Updates:
If you're using CCleaner Professional you can set it to automatically check for, and apply updates. To do this:
1. Click Options
2. Click Settings
3. Tick Enable silent background updates:
You MUST be registered to receive automatic updates. To verify that you have registered, go to Options > About, and check that your name is listed next to "Registered to:" If not, then click "Register/Upgrade to Pro" and enter your license details.
It may take a day or two for updates to apply when using automatic updates. There are no additional charges for each update.