A crack works by modifying the program's executable code. This tampering can have unpredictable consequences. In technical calculation software, it could disable critical internal checks and balances, leading to incorrect analysis results. For an engineer or architect, this is disastrous. If you use a cracked version that incorrectly calculates the load-bearing capacity of a beam or the thickness of a foundation, you could be creating an unsafe, non-compliant, and potentially dangerous building.