Windows Defender might still block files. Try to disable temporarily and unpack the files again to make sure they work properly.
Trying to download LTSC, but keep getting [ERROR] Download aborted, and download speeds are really slow ~100 KiB
Using the old Up/Downgrade trick. Needs LTSB ISO and some registry entries. Backup is recommended. To switch to LTSB 2016: Code: ::Up/Downgrade reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion" /v CompositionEditionID /t REG_SZ /d "EnterpriseS" /f reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion" /v EditionID /t REG_SZ /d "EnterpriseS" /f reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion" /v ProductName /t REG_SZ /d "Windows 10 Enterprise 2016 LTSB" /f
No, there is not. Maybe You mean Client Consumer to Client Business? Or maybe You mean 1607 Pro to LTSB 2016?
1803 is not the same level build as 2016 LTSB (1607). So, it would be a crosspatch for manual conversion and the 17134.619 is not an official ISO?
Thing is, a SVF with that much differences between those builds would be nearly as big as the actual LTSB ISO .