Fotografie Pro – License key expired

Hello, I purchased the Fotografie Pro theme on 24 March 2025. My WordPress dashboard now says: “Theme License: License key expired 24.03.2026. Renew?” When I bought the theme, I understood that it was a permanent license, not a one-year subscription. I cannot find any information on my invoice or other documents stating that annual renewal is required. Could you please explain why the license expired? I cant update my theme to latest version because of this problem. Thank you