CCleaner cleans up these files, temporarily freezes apps when you're not using them, and updates software drivers to make your PC faster. Note that Macs will accept licence keys for CCleaner Professional for Mac, and for CCleaner Professional Plus - but not CCleaner Professional for Windows. As it gets older it collects unused files, settings, resource-hogging applications, and out-of-date drivers which can make it slower and slower. When the registration dialog opens, enter your CCleaner Professional or CCleaner Professional Plus registration information from your purchase confirmation email. 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:ĭouble-click on the line of text which says Registered to:

You can register your license into CCleaner Professional for Mac using the following steps: Plus you can keep your activity privateautomatically and in the background. It makes it easy to speed up a slow computer by disabling resource-hogging apps and programs, updating out-of-date software drivers and more.

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: CCleaner Professional is the most powerful version of Piriform’s celebrated Mac cleaner.

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