For users on metered connections (mobile hotspots, limited DSL, or developing nations), downloading 6 GB overnight is a luxury. Furthermore, older FAT32 formatted USB drives cannot hold files larger than 4 GB. Hence, the dream of a "highly compressed" ISO—something under 1 GB—is very appealing.

Even “Lite” or “Tweaked” unofficial ISOs (e.g., Tiny10 or Ghost Spectre) remove components like Windows Defender, Edge, or Update Services. While smaller (often 2–3 GB), they are “highly compressed” – they are stripped-down, unsupported, and risky for security and stability. Microsoft does not endorse them.

First, let’s address the technical reality. A full, functional Windows 10 installation contains thousands of system files, drivers, language packs, and the WinSxS (side-by-side) component store.