1.) Software companies have to make a trade off when they implement copy protection. They want to minimize the number of stolen copies while simultaneously minimizing the number of issues they cause for paying users. As you may imagine, these are conflicting goals and piracy cannot be eradicated completely without offending those who rightfully purchase the software [think starforce]. Moreover, a car being unlocked does not give you the right to steal it.
2.) Fortunately, there are a number of free alternatives to programs like Ansys Maxwell. Some are open source initiatives from research Professors and the like, some are feature limited versions of commercial software, etc. Many of these can easily be found with google. While its not likely that any of the free softwares are as robust or feature-rich as paid versions, I believe them to be sufficient for learning purposes as desired by the OP.
3.) The original question is confusing to me. Maxwell is a simulator and predicts how a given circuit or object will perform electromagnetically. You can't really "tell" a simulator to direct current in a different direction through a structure, but you can manipulate the structure you're simulating in such a way to encourage the desired behavior.