For those of you either wanting to try or are already using Win 10 S Windows Insiders can try Windows 10 S on their PCs and join the Windows Insider Program via Settings > Update & security > Windows Insider Program to receive Insider Preview builds for Windows 10 S just as they would on other editions of Windows 10. Win 10 S will only work on PCs running either the Windows 10 Pro or Windows 10 Enterprise editions.
PC1: rs3_release x64 PC2: rs_prelease x86 PC3: rs3_release x86 PC4: rs_prelease x64 If you're using rs3_release. Sign out of the Insider Program, restart, opt in again, restart, go to fast ring and try again.
@WardocsRevenge Than wait until @Enthousiast post the UUP files, make an ISO and update. It may be a problem in your WU and it maybe will be fixed in 16273. You can't enroll because you'll lose Skip Ahead (officially) That's the only solution (I think) I can't help you much more.