I have both the classic version and Titans standalone from Steam and I went to download Titans and launched it but it loaded as the classic mode only. It would start to load the Titans start menu but after the video it'd load as classic. I re-validated the files and re-downloaded it but it still loads as classic. I have Mac OS X 10.11.6 and the latest version of Steam.
Probably an accounts issue. Your best bet is to email support@uberent.com and get them to look at it for you.
