If you already have a license, you should activate it through official channels rather than searching for public codes: How to Purchase and Activate Multisim Student Edition - NI 5 Dec 2024 —

: National Instruments (NI), the company behind Multisim, offers free versions of their software for students and educators. This often requires verification of your student or educator status.

Getting a free verified Multisim 14.1 activation code can be challenging, but there are a few options to explore:

Ngspice is more advanced and less user-friendly, but it is incredibly powerful and forms the backend for many other applications.