Once you have legally obtained the ISO and verified its hash:

The is designed for specialized, mission-critical devices where stability is paramount and frequent feature updates are undesirable. Windows 10 ltsc iot hash - Microsoft Q&A

C90A6DF8997BF49E56B9673982F3E80745058723A707AEF8F22998AE6479597D SHA-1: 2FB2897373C4F71B06F4490943B3D564B0F0FD6D File Size: 4.56 GB (4,899,461,120 bytes) Support Lifecycle