Thats a first, never heard that one before. Try deleting them again and and then reinstalling cause last night we were having trouble with our downloads. Most of our downloads are being pulled from a different server. We never got around to moving everything over to our new server so you could have gotten a corrupt file. Only other thing I can think of is to delete them and install them manually. 

http://mattman69.com/stuff/Downloads/UTDCv18.zip