The installer includes a built-in "crack" (often a KMS hack ) that automatically bypasses the Microsoft activation process .

End of support for Windows 11, Windows 10, Windows 8.1 ... - ASUS

: This typically refers to a modified installer where a "crack" or unauthorized activation script

: "MUL" indicates that the ISO includes multiple language packs, allowing users to switch system languages easily during or after installation.

You cannot run the installation directly from a file inside Windows easily; you need bootable media.

Windows 8.1 has fewer built-in "online" dependencies compared to modern versions, which some privacy-conscious users prefer.