Go to ccleaner.com via your web browser. Download the free version of CCleaner. Once installed, open the app, go to Options - About. Click on Upgrade to Pro. When prompted, enter the provided activation code and click Register. When prompted, please leave the Name field blank.

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Windows
CCleaner will run on any PC running Microsoft Windows XP. If you're running one of the following operating systems, you're fine to run CCleaner: Windows 10 (all editions, including 64-bit) Windows 8 (all editions, including 64-bit) Windows 7 (all editions, including 64-bit) Windows Vista (all editions, including 64-bit) Windows XP (all editions, including 64-bit) Windows 2003, 2008 and 2012 Server (all editions) Since CCleaner is a small, quick program there are no minimum memory or hard drive requirements. Note 1: For Windows NT4, ME and 98, we recommend CCleaner Version 2.  For 2000 we recommend Version 3. Note 2: CCleaner does not currently support Linux.