2020-06-10

Qt 5.15 之後不再提供預編譯安裝包

根據 5.15.0 的文件指出
http://download.qt.io/official_releases/qt/5.15/5.15.0/OFFLINE_REAMDE.txt

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Due to The Qt Company offering changes, open source offline installers are not available any more since Qt 5.15. Read more about offering changes in the https://www.qt.io/blog/qt-offering-changes-2020 blog.

If you need offline installers, please consider our new Qt for Small Business offering: https://www.qt.io/blog/available-now-qt-for-small-businesses

由於Qt公司的政策改變，以後不再提供預先編譯好的離線獨立安裝包，只能線上安裝了，
要離線安裝包，要購買 Qt for Small Business 產品。

其他參考
歷代的離線安裝包下載網址
https://download.qt.io/archive/qt/
http://download.qt.io/official_releases/qt/
Qt 線上安裝器下載網址
http://download.qt.io/official_releases/online_installers/
【Qt】 Qt 5.15 在线安装_风语留痕-CSDN博客
https://blog.csdn.net/kingkee/article/details/106424024