The official MDL forum thread for Microsoft Toolkit was deleted or hidden years ago. The only remaining copies of microsofttoolkit241windows8andoffice.exe exist on sketchy file lockers (MediaFire, Uploaded, Rapidgator). These files are often password-locked RAR files – a classic malware delivery method.
To understand the allure, you must understand the technology. Microsoft Toolkit did not "crack" code in the traditional sense (like patching .exe files). Instead, it exploited legitimate Volume Licensing features.
If you are still running Windows 8 or 8.1 and relying on Microsoft Toolkit 2.4.1, you are in a precarious situation.