V7.10.020.3176 is a reliable tool for legacy systems, but it is not freeware. If you have an old license, use it. If you do not, either purchase a legitimate key from Faronics (or a downgrade right from their current version) or switch to a free, open-source alternative.
: Deep Freeze operates at the kernel level; using an unauthorized key can lead to system instability, boot loops, or permanent data loss if the "Frozen" state malfunctions. License Key Deep Freeze Standard V7.10.020.3176