Do not confuse the offline installer with the source tarball ( qt-everywhere-src-5.15.2.zip ). The source requires compilation (30+ minutes). The offline installer provides pre-built binaries, Qt Creator IDE, and examples in a single click.
Some developers prefer to avoid creating a Qt account. For Linux users with the .run offline installer, no account is required—the installer works completely offline. qt 5152 offline installer
Once you have downloaded the installer file matching your operating system (e.g., .exe for Windows, .run for Linux, or .dmg for macOS), follow these steps to install it smoothly. Do not confuse the offline installer with the
Double-click the downloaded .exe file.