Assuming you obtain a legitimate copy, here is what makes version 661 a workhorse:

: Deep Freeze 661 offers comprehensive protection against malware, viruses, and other malicious threats. It ensures that the system remains frozen, reverting to a previous state, thereby preventing any permanent damage.

Version (often part of the Deep Freeze 8.x or Enterprise generation) is particularly renowned for:

Use 661 only for legacy/mission-critical labs with older hardware. For new deployments, search for "Deep Freeze Enterprise 10 full download exclusive" instead.

: A 24-inch wide, European-made refrigerator-freezer often used for undercounter or freestanding storage. You can find technical specifications and manuals directly on the Summit Appliance website ARINC 661 Standard