Windows — 8 Highly Compressed

Even a "highly compressed" version must eventually expand to meet the Windows 8.1 minimum requirements to function properly: Minimum Requirement 1 GHz or faster with support for PAE, NX, and SSE2 RAM 1 GB (32-bit) or 2 GB (64-bit) Storage 16 GB (32-bit) or 20 GB (64-bit) Graphics DirectX 9 graphics device with WDDM driver The Risks of Using Compressed ISOs

If you have a compressed ISO file, the installation follows these general steps: windows 8 highly compressed