Short-term: The v337z resetter was effective for IDM versions up to 6.41. However, IDM’s developers (Tonec Inc.) are aggressive. They frequently release silent updates that detect fake licenses.

An open-source script method that allows you to see exactly what registry keys are being modified. Buy a License:

While the IDM 6xx Activator/Resetter v337z can provide temporary access to IDM's premium features, there are some considerations: