If that's not possible, you’ll need to contact the software support team. Explain the situation with your old PC being dead, and ask them to reset or transfer the activation. Most companies have a process for dealing with this, but you may need to provide your license key and possibly some proof of purchase.
Let me know if you need further assistance!
It sounds like the activation key for P2A (Producer to Application) is tied to the hardware of your old PC. Since the old PC is no longer available, you'll likely need to deactivate the license on that machine.
First, check if you have any backup files or access to your previous account where the activation might have been registered. Sometimes, software companies like allow you to manage activations via an online account.