To run NX 12 natively on an older Mac, your system must meet specific legacy criteria:

If your company has a long-term relationship with a PLM partner, they may host archived installers for older versions like NX 12 on their internal portals. Technical Requirements for Legacy macOS Installation

Native support for macOS officially ended with , which saw its final maintenance updates in December 2019. Because newer versions of macOS have changed significantly—especially with the transition from Intel to Apple Silicon (M1/M2/M3 chips)—running a "native" NX 12 installation today is technically complex and often unstable. Where to Securely Download NX 12