I have a similar problem.
I updated from 13.17 to 13.18 after the Direct X question (answering Yes) it seems like it doesn't proceed. Found old threads where other had similar problems and reinstalling from the update folder would fix it but no help there. I saw this thread and saw @LCMan27 say 13.17 installs and reboots successfully so I went back to 13.17 it works fine but it seems like 13.18 keeps reinstall if I restart Launchbox