If a "License Key Already in Use" error appears, email mac_support@trendmicro.com with proof of purchase.
To activate Cleaner One Pro legitimately, follow these steps provided by Trend Micro Support: Trend-Micro-Cleaner-One-Pro-2020-Activation-Code-Crack
Cracked versions cannot access legitimate, official Trend Micro support, leaving you without help if the software fails. If a "License Key Already in Use" error
Using cracked software, keygens, or unauthorized activation codes for Cleaner One Pro poses significant security threats: official Trend Micro support
Ensure the code is typed correctly. If the error persists, contact Trend Micro support for verification.