It always happens at the worst possible time.
Before assuming you need to buy a new license, verify what CATIA sees: The Expiration Date Of Your License Has Arrived Catia
: If you have recently changed hardware (like a network card), your computer's "Target-ID" may no longer match the ID tied to your license file. Residual Settings The Expiration Date of Your License Has Arrived:
Many companies own perpetual licenses (they paid a large upfront fee). However, these licenses do not last forever without maintenance. A perpetual license has two dates: The Expiration Date Of Your License Has Arrived Catia
Options for Catia Users with Expiring Licenses