I installed the game using the CrossTie and a downloaded the installer from Funcom (not Steam). It's a bit wonky with the colours, but it runs and that at an acceptable speed; nothing like the slideshow it was on older versions of CrossOver.
As there doesn't seem to be an entry any more for The Secret World itself...I tried that as well, and it also runs without problems and at an acceptable speed.
Only 4 stars because of the colour problems that persist.