If your supplier is unavailable, some technical support sites like Hi-Read Lock or Proyu Tech provide registration services for their customers.
Modern ProUSB systems (v2.0 and above) use RSA or ECC asymmetric encryption. The "generation link" would need to contain the private key to create a valid signature. Prous Science (Clarivate) guards this private key on internal, offline servers. No public link contains it. prousb serial no generation link
