Standard Windows 8 installations typically require several gigabytes of space. "Highly compressed" versions achieve a 100MB size through two primary methods:
Use a virtual machine (VirtualBox or VMware) with a dynamically expanding virtual disk. Download the official 90-day evaluation VHDX from Microsoft (formerly available for Windows 8.1 Enterprise). Windows 8 Highly Compressed 100mb
Using tools like 7-Zip or WinRAR, the files are packed using maximum compression settings. However, decompressing these files can take hours and heavily tax your CPU and memory. Why You Should Be Cautious using WinReducer or MSMG Toolkit) would:
A legitimately compressed Windows 8 (e.g., using WinReducer or MSMG Toolkit) would: Windows 8 Highly Compressed 100mb