Microsoft officially ended support for 1709 in 2020. This means no security updates.
Foxos Windows 10 1709 appears to be a custom or repackaged distribution of Windows 10 version 1709 (the Fall Creators Update). This post explains what 1709 is, what a “Foxos” build likely implies, how to obtain and verify ISOs safely, installation steps, compatibility and driver considerations, common tweaks included in custom ISOs, legal and security cautions, and troubleshooting tips. ---- Foxos Windows 10 1709 - Iso
An ISO image (or .iso file) is an archive file that contains the contents of an optical disc, such as a CD, DVD, or Blu-ray disc, in a single file. Windows 10 ISO images can be used to create bootable media (like a USB drive or a DVD) that can be used to install Windows on a computer. Microsoft officially ended support for 1709 in 2020