[Drako]

I might have found a working method, but I can't be 100% sure because I haven't tested it out myself.

1. Open notepad as an administrator
   
2. Go to your hosts file, located in "c:\windows\system32\drivers\etc\hosts"
   
3. Add a new line with "127.0.0.1          license.piriform.com"
   
4. Save the changes
   
5. Register CCleaner with one of the licenses below
   

C2YW-P4SU-S2JI-QIDC-QZPC
C2YW-6G7F-3VF3-EK47-NZPC
C2YW-9B5X-5MAD-QEZT-6ZPC
C2YW-R8U7-BQNZ-GPZ7-KZPC
C2YW-DGC9-8IK9-SNC6-YZPC
C2YW-HSPY-3SI2-JC8A-4ZPC
C2YW-M5EG-GYXY-T6K4-EZPC
C2YW-FKMK-BUDH-X6WC-GZPC
C2YW-Z7GE-2AFM-AUMG-GZPC
C2YW-AFZF-RYD4-KPED-AZPC