License key does not work.
Resolution: Make sure you are entering your correct license key. Receipt numbers are sometimes mistaken for license keys. Please re-check your order information email for your correct license key. Some helpful tips regarding your license key:
1. Copy (Ctrl + c) and paste (Ctrl + v) of your license key is recommended.
2. The correct license key format for Smart PC Cleaner is: XXXX-XXXX-XXXX-XXXX (four series of four characters).
3. Please note that any 0 in the license key is a zero.
4. If you've check all the above and your key still does not work, please contact Customer Service for a new key.