To activate NI Multisim 14.3, you need an official serial number provided by National Instruments (NI) or your educational institution
Academic Volume License: If your school or university provides Multisim, you must contact your institution's software administrator or IT helpdesk to receive the school's authorized serial number. Ni Multisim 14.3 Serial Number
Digital Purchase: Check your confirmation email from National Instruments (NI) or the NI Customer Service portal . To activate NI Multisim 14
The location of your serial number depends on how you acquired the software: If you're having trouble with installation, activation, or
Challenges in Obtaining a Serial Number