Always verify checksums to avoid malware.

The installer includes precompiled libraries for OpenSSL, ICU, and ANGLE (for OpenGL emulation). Rebuilding these from source is tedious; the EXE provides them out-of-the-box.

Qt 5.15.2 Licensing Overview (PDF) (printable as PDF)

In the fast-paced world of software development, where frameworks update at breakneck speed, it is rare for a specific version of an installer to become a "legendary" or "golden" release. Yet, in the Qt ecosystem, the file named holds a special, almost sacred status.