Office Pro Plus 2021 only support Office Deployment Tool (ODT). To install the new Office 2021: 1. Download the latest ODT from Microsoft Download Office Deployment Tool from Official Microsoft Download Center 2. Extract the ODT files where you want them. Eg, C:\temp\Office2021 3. Run Powershell with elevated permission as below > .\Setup.exe /configure .\configuration-Office2021Enterprise.XML