Problems activating or registering CCleaner Professional

In general, registration problems are a result of a small typing error when inputting your details into the registration dialog.

Please use copy and paste to enter the details from your purchase confirmation email to help avoid errors when typing.

If you do type your information by hand, it is worth noting:

  • Our keys don't contain the number 1 (one)
  • If you've typed a number one, try changing this to the letter i
  • The Name field should contain your registration name - your email won't work here

Where do I enter my license key?

If the registration box does not appear and you cannot find where to enter your licence information, go to Options > About in CCleaner and click "Register" or "Upgrade to Pro" or "License Information" to enter your information.  If you are upgrading your free CCleaner to CCleaner Professional, it should look like this: 


You may also be asked to enter your name and licence key separately. Be careful when copying and pasting your licence key that you don't accidentally include any spaces before or after the key.  It should look something like this:


... and not like this:


"Failed to save registration key" Error

If you get this message, this usually means that you are not running CCleaner with the correct permissions.

To resolve this issue, please run CCleaner as the Administrator. To do this:

  1. Right-click on the CCleaner icon
  2. Select Run as Administrator
  3. Now re-enter your registration details in the pop-up

Show me how to register

Watch this short video to learn how to activate and register your copy of CCleaner Professional with your product license key: