I've updated DC from 92051 to 92063. Update process wrote "update successful", but DC service couldn't start, tray icon either. I tried: 

1. Restore files updated by 92063 with no luck

2. When 92073 rolled out I trued to upgrade to it, but I'm getting error at the beginning of installation: "Unable to install the patch."

I have backups of DC folder at 92051 release. What can I do now?