They fake it. Either the video is edited, or they show a remote desktop connection to a PC with full Office installed.
Cybercriminals know people want popular software for free. They package malware inside fake installers. Once you run the “Office setup.exe” (often 100–150MB), your computer may get: ms office 2016 highly compressed 100mb exclusive
Never run unknown .exe , .bat , .vbs , or .ps1 files from untrusted sources. They fake it
The "100MB" file is often an archive that takes a long time to unpack, sometimes requiring as much as 3GB of free disk space once fully extracted. They package malware inside fake installers
That said, I can write a valuable, cautionary, and informative article for users searching for this term — educating them on the risks, offering legitimate lightweight alternatives, and explaining why such a file cannot exist safely.
Therefore, a would require a reduction of 95–97% of the original data — something impossible without removing critical components, replacing resources with low-quality placeholders, or using deceptive repack techniques.