If you already have a license, you don't always need a high-speed connection during the entire installation process. Microsoft provides an for this purpose.
refers to the traditional desktop version of Microsoft Office (e.g., Office 2019, Office 2021, Office LTSC) that is installed directly on your local computer (Windows or macOS) and does not require a continuous internet connection to create, edit, or save documents. ms office offline
To use Office apps locally on your device, you generally choose between a subscription model or a one-time purchase. If you already have a license, you don't