You have three options to get this legally:
The Original Blueprint: Exploring Windows 10 RTM Core Single Language windows 10 rtm core single language iso download
Windows 10’s mainstream support ended in 2025. Extended support continues through 2028 for some editions, but security updates are dwindling. Consider Windows 11 if your hardware supports it. You have three options to get this legally:
stands for Release to Manufacturing . Historically, this referred to the final version of Windows sent to computer manufacturers (OEMs) to install on new laptops and desktops before the public launch. stands for Release to Manufacturing
Microsoft does not make the RTM 1507 (Build 10240) ISO available on the official Windows 10 Download page anymore.
Microsoft typically provides the most current version (like 22H2) through their official portal. However, you can still get the ISO you need using these methods: Windows 10 Home Single Language RTM [x86/x64] : Microsoft
Do not connect an RTM 10240 machine to the internet without a firewall. It has dozens of unpatched remote code execution vulnerabilities.