A developer or group named DAZ created this tool.
WAT stands for Windows Activation Technologies. Microsoft uses WAT to find fake copies of Windows. The "WAT Fix" part of the tool stops Microsoft from checking the license status.
Windows Loader 2.1.5 By DAZ WAT Fix is a software tool designed to activate Windows operating systems, including Windows 7, Windows 8, and Windows 10. Developed by DAZ, a well-known figure in the software cracking community, this tool is capable of bypassing the Windows Activation Technology (WAT) and providing users with a fully functional, activated version of Windows.