Yes, one or more of your U.I. 1.1 downloads is incomplete. Right click the first part, Open With WinRAR, and click the "Test" button on the toolbar. You'll get a complete list of all errors in the entire 8 part archive. This will help you identify which part or parts are corrupt so you can download them again.
That is the only solution...download again.
Ah oke, thank you very much!