The student edition is free but restricted to prevent professional use: PSPICE Links

PSpice 9.1 Student Version is a legacy circuit simulation tool that remains popular due to its simplicity and lightweight nature, even on modern systems . This version is distributed freely and is designed for academic use with specific circuit limitations.

For most 1st and 2nd year engineering circuits (diodes, transistors, basic op-amp circuits, RC filters), the student version is perfectly adequate.

Often, the safest download is a copy from your professor or a senior student who saved the original installer from the official CD.