It is important to note that the availability of standalone offline installers depends on your licensing type:
The is a critical tool for developers who need to install the Qt framework and its associated development tools in environments with limited or no internet connectivity . As a Long-Term Support (LTS) release, Qt 6.5 provides a stable foundation for cross-platform applications with three years of standard support for commercial license holders. Availability of Offline Installers download qt 6.5 offline installer
how to download Qt online/offline installers? : r/QtFramework It is important to note that the availability