If you manage vintage hardware (e.g., Windows 7 SP1 with limited RAM), and the latest Deep Freeze version is too heavy, you have two choices:

If you previously owned Deep Freeze 863 but lost the key, check your old emails. Faronics provides a License Retrieval Tool on their support site. Enter your order number or registered email to resend your original activation key.

Cybercriminals know that Deep Freeze is security software. They hide Trojan horses, keyloggers, and even ransomware inside "cracked" installers. Ironically, you might install a program meant to freeze the system, only to lose all your data.