As of 2026 (the date of this article's hypothetical publication), Qt 6.x is mature (Qt 6.5 LTS, 6.8 LTS). Why would anyone choose Qt 5.15.2?
: You can use the qt-unified online installer binary with the create-offline command to build a tailored installer. qt 5152 offline installer
While official pre-built offline installers for open-source users have become restricted or removed from the main download page, there are several ways to obtain this version: Method Description As of 2026 (the date of this article's
Depending on your license and needs, there are three primary ways to obtain this version: Commercial Users (Offline Installer) Log in to your Qt Account to download the standalone offline package. qt 5152 offline installer
Installing 5.15.2 via the offline package is straightforward, but selecting the right components is key to saving disk space. Run the downloaded file.