Most "100MB" versions are heavily stripped down ("Lite" versions) where core features, drivers, and security components have been removed to reduce the size.
While searching for "Windows 8 highly compressed 100MB updated" may lead you to various download links, it is mathematically and technically impossible to shrink a fully functional version of Windows 8 down to 100MB. A standard installation of Windows 8 requires several gigabytes of data to function. The Reality of "Highly Compressed" OS Files windows 8 highly compressed 100mb updated
Most "highly compressed" builds come with built-in activation. Most "100MB" versions are heavily stripped down ("Lite"