The LTSC version is preferred for "Embedded" use cases because:

It is important to note that while the ISO is free to download from evaluation portals, Windows 10 IoT Enterprise is not free to use. It requires a specific license key usually purchased through an Authorized Microsoft Embedded Distributor. Unlike Home or Pro, you cannot typically buy these licenses at a retail store; they are sold to OEMs (Original Equipment Manufacturers) for use on dedicated hardware.

Once you have downloaded your ISO file, you need to "burn" it to a USB drive to install it on your device.

If you want to test the OS before purchasing a license, the Microsoft Evaluation Center is the best starting point. Navigate to the Microsoft Evaluation Center website. Search for "Windows 10 IoT Enterprise."

Windows 10 IoT Core: This is a stripped-down version intended for small, low-power devices like the Raspberry Pi. It does not have a traditional Windows desktop interface. Where to Download the Official ISO

For developers and enterprise partners, the most reliable way to get a permanent ISO is through a Visual Studio Subscription. Log in to your Visual Studio portal. Go to the "Downloads" section.