When downloading, you will typically choose between several "flavors" and architectures based on your hardware and intended use:

A police drone hummed past the frosted window. Jordan slouched lower, watching the SHA-256 checksum on the screen. If even one bit is corrupted, they thought, the whole thing fails.

Malicious actors often repackage Kali Linux with backdoors or keyloggers and upload them to torrent sites or fake "official" domains. If you install a compromised ISO, the hacker can access your machine before you even run your first nmap scan.

Their home internet was throttled to dial-up speeds. Downloading 3.8 GB would take fourteen hours. Fourteen hours of the modem’s green light flickering, broadcasting their intent to the ISP.