The concept of a version refers to unofficial, modified "Lite" or "Super Lite" ISO images created by third-party developers. While a standard Windows 10 installation requires about 15-20GB of space, these versions use extreme compression and removal of core features to fit into a tiny installer. Key Characteristics of 100MB Highly Compressed Versions
Microsoft requires a minimum of 16 GB of hard disk space for a 32-bit OS, and even that is a tight squeeze. Core Files: Windows 10 32 Bit Highly Compressed 100mb