If you did not buy MS Office directly from Microsoft, but want to purchase a product key from a third party vendor, you often have to look for a reputable download source yourself. Here you can find the download links directly from Microsoft.
Download MS Office as IMG file – here’s how it works
Downloading the Office package directly from Microsoft – without logging in – only works in a roundabout way. Installation files can be found in abundance on the Internet. However, there is a risk of getting embedded malware. Therefore, you should only download Office directly from Microsoft servers.
Download Office 365
Download Office 2019
Download Office 2016
By the way, downloading these ISO files should be perfectly legal as long as you run your Office installation with an official product key.
How to install MS Office from an ISO file
First, download the IMG file you need. Then open the file’s location and right-click the file. Now, click »Mount«.
The IMG file now gets mounted into the file explorer. It is also visible under “My PC” as a drive. Click on it and run the file “Setup.exe”. After granting administrative privileges, the installation will start.