: These files are often "pre-activated" or include scripts for illegal activation, which constitutes software piracy. Breakdown of the File Name Windows 10 X64 20H2 Pro OEM ESD MULTi-7 MARCH 2021
: Unofficial ISOs are frequently modified to include "clipper" malware, which can steal cryptocurrency from your clipboard, or UEFI-level hijackers that activate every time your PC boots, making them nearly impossible for standard antivirus software to detect.
: Modified versions can have keyloggers integrated directly into the OS, allowing attackers to capture every keystroke, including passwords and credit card information.
: Many "custom" ISOs, especially those marketed for gaming or "debloating," often disable essential security tools like Windows Defender , User Account Control (UAC), and the Windows Firewall by default to save system resources.