digital_IoT_Ent_LTSC_2021 
1. Unpack RAR
2. Open digital_IoT_Ent_LTSC_2021 folder
3. Run digital_IoTEnterpriseS.cmd file as Admin.
4. Done
Note: No need to turn off any AV.
P. S.: This Script contains alive Default Key for Win 10 IoT Enterprise LTSC 2021 from this post. It"s for thouse who want to get Genuine Digital License for Win 10 IoT Enterprise LTSC 2021. Also possible to use this Script to upgrade Win 10 Enterprise LTSC 2021 to IoT Enterprise LTSC 2021 Edition and get Genuine Digital License for it.