I don't know, I have always downloaded from the site they gave but it is A Microsoft Site. I have bought cheaper keys from someone overseas, but one of them un-activated after 6 months. From Softwares.com I have bought and installed Office 2021 3 times and Windows 10 pro once all still working OK.
I believe the link they provide is from Microsoft. So you can try it, if not then download from the site they give , then make a ISO to a USB ot DVD to install.
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