Problems activating or registering CCleaner Professional

This article contains help if you are having trouble registering your copy of CCleaner Professional or CCleaner Professional Plus for Windows or CCleaner Professional for Mac.

If you get an error saying that your licence key is not valid

In general, registration problems are a result of a small typing error when inputting your details into the registration dialog.  It is usually easier to use copy and paste (Ctrl-C and Ctrl-V on Windows, Cmd-C and Cmd-V on a Mac) 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 capital letter i
  • The Name field should contain your registration name - your email won't work here

You may also have problems registering if:

  • Your CCleaner licence has expired
  • You are trying to use a CCleaner Professional for Windows licence key on a Mac, or a CCleaner Professional for Mac licence key on a Windows PC.  Note that a CCleaner Professional Plus key will work on both Macs and Windows PCs.

If you have lost your CCleaner registration information, or otherwise need to check the status of your licences, expiry dates or get new download links to install on other computers you can do so using our licence lookup system.

Where do I enter my license key? (CCleaner for Windows)

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 : 

Screenshot of CCleaner registration screen

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:

Screenshot of licence key entry window

... and not like this:

Screenshot of licence key entry window

"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

How Do I Register CCleaner Professional for Mac?

You can register your licence into CCleaner Professional for Mac using the following steps:

  1. Open CCleaner > click Options > About
  2. Click "Register" or "Upgrade to Pro"

Otherwise if a licence is already registered in the CCleaner app but you need to activate a new replacement licence key, you can do so as follows:

  1. Open CCleaner > click Options > About
  2. Double-click on the line of text which says "Registered to: [Your Name]"

When the registration dialog opens, enter your CCleaner Professional or CCleaner Professional Plus registration information from your purchase confirmation email.