Contact NI support with proof of purchase. They can reset the activation count for your serial number (reasonable requests only).
This comprehensive guide explains how to generate NI LabVIEW offline activation codes securely and legally, troubleshooting common issues along the way. Understanding NI LabVIEW Activation ni labview offline activation code top
This is a unique identifier generated by the NI License Manager on the target machine. Contact NI support with proof of purchase