Avoid "cracked" or "free license key" sites. These often contain malware, and the keys are usually blacklisted, causing your software to deactivate unexpectedly. Steps to Acquire or Retrieve Your License
If you can provide the you're getting or if your license is for a 32-bit or 64-bit version , I can give you more precise instructions. Alternatively, I can help you find the official ExtendOffice renewal page . Need to reinstall KuTools. - Microsoft Q&A kutools licence name and code new