Captcha is required when a user enters an incorrect password for 5 consecutive times. At that time, you should log into Katalon TestOps with that account and enter the captcha. After that, you should be able to activate Katalon Studio normally.
If you encounter an activation failure, click on the Troubleshoot button right next to Activate button. You can find our guidance for resolving common activation problems. And here’s the resolution to the CAPTCHA issue: " CAPTCHA is required when users enter incorrect passwords for multiple consecutive times. At that time, you should log into Katalon TestOps with that account and enter the captcha. After that, you should be able to activate Katalon Studio normally."