I don't know if it changed, but near the end of last year, via a simple Google Search, you could download an ISO for Office 2021 legally and just use your key during installation. This may have been removed because the site hosting the file was NOT affiliated with Microsoft. (It was an unaltered copy though, so no virus, hacks, etc.)
Microsoft also allows users to download setup Wamedia of various Office versions in form of installation disc as well as offline ISO or IMG files. They provide the setup files of Office to help users manage and restore Office products in their computers in case they have lost the original setup disc.
STEP 5: Run Office Installer to Install Selected Programs. Now the final step! We need to run the setup.exe file with correct parameters in Command Prompt to install selected Office programs with our predefined settings in configuration.xml files. Run following command in Command Prompt:
Find the direct links to download Office 2019, 365 and 2016 ISO or IMG files without signing in. Learn how to mount the ISO or IMG files in Windows and access the Office suite offline.
Use /quiet to run the installer silently. Use /layout to specify where the offline install files will be copied to. adksetup /quiet /layout c:\temp\ADKoffline Copy the downloaded files to a location that the offline computer can access. For example, copy the files to removable media or to a file server that the offline computer can access.
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office 2019 offline installer iso