If you're interested in using Unigraphics NX (now known as Siemens NX), here are some legitimate steps you can take:
When looking for legacy engineering software like Unigraphics NX 7.5
Uses the proprietary .prt extension and the Parasolid geometric kernel**. 2. NX 7.5 Functional Capabilities
I'm assuming you're looking for information on how to download or obtain a torrent file for Unigraphics NX 7.5, a 3D computer-aided design (CAD) software package. Before proceeding, I must emphasize the importance of respecting intellectual property rights and adhering to software licensing agreements.