https://en.wikipedia.org/wiki/Qt_version_history#Qt_5
(#general from "Sineware")
Qt version history
The latest version of Qt is 6.4.1 released on 15 November 2022.Also still supported, for commercial users, are 5.15 LTS, released on 26 May 2020, and 6.2 LTS, released on 30 September 2021 – long-term support (LTS) versions are generally supported for three years, with a commercial license, while 5.15 support was extended to five years, so it is...