以下地址下载后是一个setup.exe文件，需要在联网的情况下，双击运行，则程序会自动下载会安装。如果下载英文版，则将以下链接中的zh-CN修改为en-us。

Office 2021 Professional Plus 简体中文–32位

https://c2rsetup.officeapps.live.com/c2r/download.aspx?ProductreleaseID=ProPlus2021Retail&language=zh-CN&platform=x86&TaxRegion=PR&Source=O15PKC&version=O16GA

Office 2021 Professional Plus 简体中文–64位

https://c2rsetup.officeapps.live.com/c2r/download.aspx?ProductreleaseID=ProPlus2021Retail&language=zh-CN&platform=x64&TaxRegion=PR&Source=O15PKC&version=O16GA

Office 2021 Visio Professional 简体中文–32位

https://c2rsetup.officeapps.live.com/c2r/download.aspx?ProductreleaseID=VisioPro2021Retail&language=zh-CN&platform=x86&TaxRegion=PR&Source=O15PKC&version=O16GA

Office 2021 Visio Professional 简体中文–64位

https://c2rsetup.officeapps.live.com/c2r/download.aspx?ProductreleaseID=VisioPro2021Retail&language=zh-CN&platform=x64&TaxRegion=PR&Source=O15PKC&version=O16GA

Office 2021 Project Professional 简体中文–32位

https://c2rsetup.officeapps.live.com/c2r/download.aspx?ProductreleaseID=ProjectPro2021Retail&language=zh-CN&platform=x86&TaxRegion=PR&Source=O15PKC&version=O16GA

Office 2021 Project Professional 简体中文–64位

https://c2rsetup.officeapps.live.com/c2r/download.aspx?ProductreleaseID=ProjectPro2021Retail&language=zh-CN&platform=x64&TaxRegion=PR&Source=O15PKC&version=O16GA