This "Lite" version is a customized ISO of Windows 8.1 Professional (64-bit) in Brazilian Portuguese (PT-BR). The primary goal of this release is to strip out "unnecessary" Windows components to make the operating system run faster on older hardware or low-end computers, and to reduce the installation file size.
The search promises a fast, free, Portuguese-friendly version of an old operating system. In practice, it delivers malware, data theft, and a ticking security bomb. windows 81 pro x64 lite ptbriso free extra quality