The official and safest source is the Kon-Boot website. The modern installer requires an internet connection and is designed to create a bootable USB drive directly rather than providing a standalone ISO file. Risks of "Free Top Download ISOs"

It is highly recommended to avoid "free iso" downloads from unofficial sites, as these often contain malware like VirTool:Win32/Konboot .

The version often sought as "v1.1 free" is frequently a legacy version or a mislabeled version of the original freeware release.

Current versions of Kon-Boot are paid commercial products. They are the only versions officially capable of bypassing modern security features on Windows 10 and 11, including online "live" account passwords.

There is a significant difference between the free and paid versions:

Corrupted ISO files with wrong UEFI/Secure Boot signatures can corrupt your bootloader, requiring a full OS reinstall.