If you see "Trial Mode" or a watermark, the activation didn't "stick." Go back to the Lightroom Plug-in Manager, select Negative Lab Pro, and check the "License" section to ensure it says . Troubleshooting Common Install Issues "Invalid License Key" Error
Copy the license key from your receipt email and paste it into the field next to the key symbol (🔑) .
: Copy the key from your email, paste it into the field next to the key symbol ( ), and click Confirmation