Qt-opensource-windows-x86-5.15.2.exe Link

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.\qt-unified-windows-x64-online.exe --mirror https://mirrors.tuna.tsinghua.edu.cn/qt/

If you are using this installer to build new applications, keep these migration barriers in mind:

Since the offline installer is inaccessible, open-source developers must install Qt 5.15.2 using the online installer tool. The process is well-documented but can be challenging due to the advanced age of this version.