Downloading and using "free pre-activated" versions of Windows 8.1 Pro VL (Volume License) from third-party sources is not recommended due to significant security and legal risks. These files are often modified to bypass official activation, which can expose your system to malware and prevent you from receiving critical security updates. Understanding the Terms Windows 8.1 AIO x64 Pre-Activated ISO - Scribd
Multi-6: This usually refers to a "Multilanguage" ISO that includes six different language packs (often English, Spanish, French, German, etc.) built into the installer. full windows 81 pro vl x86 multi6 esd preactivated free
A version intended for large organizations that activate many computers simultaneously. A version intended for large organizations that activate
What you’re describing is almost certainly a pirated or unauthorized copy of Microsoft Windows. “VL” (Volume License) copies are meant for organizations with paid agreements, and “preactivated” usually means it has been illegally cracked to bypass Microsoft’s activation system. etc.) built into the installer.
Purchase Directly from Microsoft: Microsoft's official website and authorized resellers are the best places to buy legitimate copies of Windows.