RemoveWAT (Windows Activation Toolkit) is a popular activator tool used to activate Windows 7 and other Windows versions. The tool is designed to remove the Windows Activation Technology (WAT) and bypass the activation process.
The version you mentioned, v2.2.5.2, seems to be an older version of the RemoveWAT tool. Newer versions might be available, but I couldn't find any information on the latest versions.
That being said, here's some information on the tool you mentioned: