If you absolutely must have a perpetual Office 2019 license, you can sometimes find from reputable marketplace sellers — but this requires extreme caution. Some guidelines:

A powerful, free, and open-source office suite.

Some repositories on platforms like GitHub claim to offer "Office 2019 activation keys" or key generators. These projects almost always include clear legal disclaimers stating they are and explicitly note that unauthorized distribution violates Microsoft’s Terms of Service.

Using unauthorized activation scripts violates Microsoft's Terms of Service and End User License Agreement (EULA). For businesses, schools, or freelance professionals, using pirated software can result in severe financial penalties, failed software audits, and potential legal action. Safe and Legal Alternatives to Free Activation Scripts