The keyword “exclusive” captures the emotion of the search. The offline installer is not technically “exclusive” in the sense of being completely hidden or proprietary—it just does not exist for open‑source users. The exclusivity belongs to the commercial license holders. For the open‑source community, the path to Qt 5.15.2 still exists, albeit through the online installer or source compilation.
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This is where you choose exactly what to download. Expand the tree: qtopensourcewindowsx865152exe exclusive