There are two ways to see "U. of Denver Fulltext" links within Google Scholar results.
1. Go to the Library homepage (library.du.edu). Then click the Google Scholar link. this invokes a URL with Google's code for the University of Denver. This is a temporary fix, as it does not save the setting in your browser.
2. Go to the Google Scholar settings (upper left corner), select Settings, then select Library Links. Search for Denver and select the U. of Denver checkbox. Saving these settings will allow your browser to remember them.