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
由于Qt Company提供的更改，自Qt 5.15开始，不再提供开源脱机安装程序。在https://www.qt.io/blog/qt-offering-changes-2020博客中了解有关提供更改的更多信息。
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
https://download.qt.io/archive/qt/5.15/5.15.0/
可以在线安装，在线安装器下载地址http://download.qt.io/official_releases/online_installers/