Download the Office LTSC 2021 installation files (optional, if not installing directly from the Office CDN).Download the Office Deployment Tool from the Microsoft Download Center.The following steps are the basic steps for deploying Office LTSC 2021: For example, some devices might not have connectivity to the internet or you might have limited bandwidth to the internet. But you might have constraints that prevent you from installing directly from the internet. Installing directly from the Office CDN requires the least amount of administrative effort and is recommended. Whichever method you choose, you use the ODT.
You can use different methods for different sets of devices in your organization. Or, you can download the installation files from the Office CDN to a location on your local network, such as a shared folder, and install Office LTSC 2021 from that location. You can install Office LTSC 2021 directly from the Office CDN. The installation files for Office LTSC 2021 are available on the Office Content Delivery Network (CDN) on the internet instead of on the Volume Licensing Service Center (VLSC). The Office Customization Tool (OCT) that you previously used for Windows Installer (MSI) is no longer used. To configure and perform deployments of Office LTSC 2021, including Project and Visio, for users in your organization, you use the Office Deployment Tool (ODT).
