Because Bitdefender remembers your network card, you need a new identity.
Editing the registry incorrectly can break your Windows installation. Backup your registry first (File > Export). bitdefender total security trial reset
If you want, I can:
If a family member has a paid multi-device license, ask them to add your device. Bitdefender Total Security allows up to 5–15 devices depending on the plan. Export). If you want