Most surviving "DLC Boot 2017" downloads are hosted on sketchy file lockers (Uploaded.net, Rapidgator, or now-defunct links). Cybercriminals have repackaged old cracks with:

DLC Boot is a bundle of diagnostic and repair tools compiled into a single, bootable interface. Created by a developer named "DLC," this software acts as a "Swiss Army Knife" for computer technicians. When your Windows operating system fails to load due to a virus, corrupt registry, or hard drive failure, you cannot run diagnostic tools installed on the hard drive.

If you are determined to reconstruct a 2017 DLC boot experience safely: