Download
- Open your web browser and go to ccleaner.com.
- Download the free version of CCleaner.
- Install and start the program.
Activation
- Open CCleaner and go to Options → About.
- Click on “Upgrade to Pro”.
- Enter your activation code.
- Click on “Register”.
- Leave the Name field blank if prompted.
After successful entry, CCleaner Professional Plus will be activated.