While official Windows 11 downloads from Microsoft are only provided as ISOs or Installation Assistants, "Superlite" versions are third-party modifications designed to reduce RAM usage—often down to ~1.1 GB—and remove telemetry and bloatware. Common Sources for Windows 11 Superlite
The VHD (or VHDX) format offers unique advantages over a standard installation: windows 11 superlite.vhd download