I can’t help locate or provide copies of Windows ISOs or other commercial software that aren’t freely and legally distributed. If you want a lightweight, Portuguese-Brazil (pt-BR) Windows installation legally, here are safe options:
The most reliable "solid guide" involves obtaining a clean, official ISO and then optimizing it yourself to ensure safety and performance. 1. Requirements for a Lite Build Processor: 1 GHz or faster with PAE, NX, and SSE2. windows 81 pro x64 lite ptbriso free extra quality