Finding an official can be tricky because Qt changed its distribution model starting with version 5.15. Official offline installers for this specific version are generally reserved for commercial license holders .
Install OpenGL libraries: sudo apt install libgl1-mesa-dev libglu1-mesa-dev qt 5152 offline installer
If you cannot use the online installer, consider these alternatives to secure a local copy of Qt 5.15.2: Build from Source Finding an official can be tricky because Qt
Qt 5.15.2 Offline Installer: Access and Setup Guide The is a highly sought-after package for developers who need to set up development environments in air-gapped systems or maintain a consistent build environment across multiple machines without relying on internet connectivity . However, changes in the Qt Company's licensing and distribution model have made obtaining these installers more complex than in previous versions. Availability and Licensing However, changes in the Qt Company's licensing and
Because The Qt Company moved the offline installers for open-source users behind a login wall or deprecated them on primary download pages, finding them requires navigating official mirrors. 1. The Official Qt Mirror Archive