Try LibreOffice or search for MSDN download links to get office ISO from Microsoft sources.
Simple google search gave this away:
*answers.microsoft.com/en-us/msoffi...ice-2019/8f9fe32e-6cca-4a69-96ed-38da8e7a9dfc
Edit: I won't share the exact download link here. Don't want digit to get into any trouble. The link on that portal above is for
cs-cz language and should be changed to
en-us for English iso.