Get-FileHash C:\path\to\your\file.iso -Algorithm SHA1
Using Windows 10 RTM in a modern environment comes with risks. Because Build 10240 is nearly a decade old, it lacks years of critical security patches and driver updates. If you install this version, it is highly recommended to immediately run Windows Update to bring the system up to a supported security level, or use it only in an offline, sandboxed environment for testing purposes. windows 10 rtm iso download
Since Microsoft no longer hosts the original 2015 RTM build for public download, users often turn to the Internet Archive for these specific historical files. Get-FileHash C:\path\to\your\file