This string defines:

You paste the string, but BioNumerics says the license belongs to another computer. The fix: Network licenses are tied to the server’s MAC address (Ethernet ID) or Hostname. If you recently replaced your server hardware or moved to a virtual machine (VM), the ID changed. You must request a new license string from bioMérieux support with the new ID.

Is this for a or a migration to a different PC?

The License ID and active string details will be listed there. Conclusion

If you lose your string but the software is already installed, you can find your details within the application: Open any BioNumerics database. to view the version and registered user info.

It is provided on the license certificate or in the delivery email sent by Applied Maths or a distributor like Bio-Rad Laboratories .