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26 minutes ago, JvdS said:

CCleaner Professional registration is not working on my iMac

It might be an idea to say what error message you get, and how you are entering the registration info.

CCleaner documentation can be found here


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Always relevant How to register and activate CCleaner Professional – Piriform Support for general guidance regarding copying and pasting licence information to avoid typing errors, and for Mac, this section:


You can register your license 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 license is already registered in the CCleaner app, but you need to activate a new replacement license key, you can do this using this method: 

  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.


Note that Macs will accept licence keys for CCleaner Professional for Mac, and for CCleaner Professional Plus - but not CCleaner Professional for Windows.  If you are still having difficulties with licence registration, you can contact support@ccleaner.com. 


Piriform Homepage - [CCleaner - CCleaner Mac - CCleaner Android - CCleaner Browser - Defraggler - Recuva - Speccy - Kamo] - Product Support

Looking for your licence key, expiry date or download link? Check here first: https://www.ccleaner.com/support/license-lookup

To find out how we protect your privacy - read CCleaner's Data Factsheet.

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