Windows 10 build 1709 or earlier failed to update to build 1803 due to the freeware Reboot Restore RX at my company. Uninstall RR, Windows will update successfully, then put RR back.
Reboot/Restore is a good software that works like DeepFreeze with the following differences:
1. DeepFreeze is not free; Reboot/Restore RX is.
2. DeepFreeze has its own security to access its settings; RR does not.
3. RR can do virtual update and true baseline update; DeepFreeze can only do true update and cannot go back once the system is changed under thawed mode.