If it helps, I maintain a MUI archive containing all the standard MUI 3.8 stuff as well as various custom classes (required for YAM, Miami, IB, AmiTradeCenter, etc).
Download it
here and follow the instructions in the .readme file to clean/update/tidy/repair/install MUI.
Existing prefs, if any, should be kept untouched. You'll need to register MUI if you want to save changes. The archive comes in demo mode, you need to supply your own keys. Registrations are still possible with Stefan Stuntz.
I'll get around to writing an installer script for it one day :-)
