vs2017 official download address and official method of establishing the offline installation package

vs2017 official Download:  https://docs.microsoft.com/zh-cn/visualstudio/releasenotes/vs2017-relnotes

The official establishment of an offline installation method VS2017  https://docs.microsoft.com/zh-cn/visualstudio/install/create-an-offline-installation-of-visual-studio?view=vs-2019