It is tempting for casual users to search for "cracks" or keygens for software like this. However, there is a compelling reason to purchase a genuine license:
: If you upgrade from the standard to the "Deep" version, you will receive a new license key. You can update this by going to Help -> About HIARCS Chess Explorer and clicking the Update license Deactivation
If you have decided that you prefer the HIARCS interface and engine despite the free alternatives, here is how to obtain a genuine license code without overpaying.