Most legitimate releases of KMSauto (from original developer forums like Ratiborus or MyDigitalLife) are packed in password-protected .rar or .zip files to prevent antivirus engines from automatically scanning and deleting the executable. Without the correct password, the archive is useless.

To summarize your search for :

While it may seem like an extra step, the password-protected archive serves several purposes for users of these tools: Antivirus Bypass