When you run the standard Setup.exe from your Microsoft account portal, it downloads the full suite into a hidden cache folder. You can copy that cache.
Here is exactly how to do it. If you manage more than one computer, skip the consumer portal. Use the Microsoft Office Deployment Tool (ODT) . This is a command-line tool that lets you download the exact version you need (32-bit or 64-bit) to a local folder. office 365 offline installer download
The solution?
Or worse: You need to install Microsoft 365 on in your office. Downloading 5GB per machine isn’t just slow—it’s a waste of bandwidth. When you run the standard Setup