Downloading software advertised as is generally unsafe and highly likely to be a fraudulent or malicious file . A genuine installation of Microsoft Office 2013 typically requires 3.0 GB of available disk space . Compressing a multi-gigabyte software suite down to 100MB—a 97% reduction—is mathematically improbable for executable software without losing critical functionality. Risks of "Highly Compressed" Downloads
If your goal is to save disk space (e.g., on a 32GB tablet or an old netbook), you have better options than chasing a mythical 100MB repack. ms office 2013 highly compressed 100mb