Navigate to the official ESET License Converter website. A quick search for "ESET License Converter" will take you to the official eset.com landing page for this specific tool.
Never rely on unofficial “key generators” or online converters. The risk of malware or credential theft is too high. Protect your digital life the right way: use ESET’s own tools to manage your licenses. eset convert username and password to license key
If you are running an older desktop client version (such as Version 9), you can perform the migration locally. Navigate to the official ESET License Converter website
Here’s the official method: