"Highly compressed" 100MB versions of Microsoft Office 2010 are likely fraudulent and carry significant malware risks, as legitimate installations require far more space and Office 2010 is obsolete. These unofficial downloads often contain pirated or malicious files, whereas official versions exceed 650MB. For secure, free, and lightweight alternatives, it is recommended to use browser-based tools like Office on the Web, LibreOffice, or Apache OpenOffice.
A full, functional, unmodified MS Office 2010 installation cannot be compressed to 100MB using standard algorithms (ZIP, RAR, 7z). Files claiming to do so are either fake, stripped of critical components, or malware vectors. Ms Office 2010 Highly Compressed 100mb
VirusTotal scans of such “100MB Office 2010” files consistently show by major AV engines. "Highly compressed" 100MB versions of Microsoft Office 2010