The tool "Office 2013-2021 C2R Install" (often created by developer Ratiborus) is third-party, non-official

Click the button. Uncheck apps you do not need:

: After installation, navigate to the Utilities tab within the tool. Typically, users perform the "Retail => VL" conversion first, followed by clicking the Activate Office button. Alternative Official Methods Office C2R Installers | MAS - Microsoft Activation Scripts

The tool, often referred to as "C2R Install" or "Microsoft Office C2R Installer" (originally based on work by developers like Ratiborus), is a third-party launcher that leverages the official Office Deployment Tool (ODT) from Microsoft. It gives users granular control over which products, apps (Word, Excel, PowerPoint, Outlook, etc.), and languages to install — without forcing bloatware or unnecessary components.

Ensure you have a working internet connection and that your firewall isn't blocking the KMS server connection.