Can you check that the download is not corrupted? If it is OK, can you send the log files as described here:
http://kb.displaylink.com/269
Do other DL software versions install OK? There have been no changes to the installer between 7.6 M0 and 7.6 M1 so if one works and one doesn't then it is probably something to do with the download.
Wim
Wim