1) Install the Watchtower Library 2012 using the Wizard CrossOver steps;
2) After the bottle created, the installation will show you an error, advising to (try again, skip this step, cancel installation). Click "skip this step";
3) The installation will finish, telling that some tasks were ignored. No problem, go ahead.
The problem is that the CrossOver program did not created the Watchtower Library shortcut, but I will explain how to:
1) Open the CrossOver app;
2) Click on Settings -> Managed Bottles
3) Select the Watchtower Library on the left and click on "Open C: Drive" on the right;
4) Click twice at Program Files -> Watchtower -> Watchtower Library 2012 -> T;
5) Select the file "WTLibrary.exe" (right button or tapping two fingers) and select "Create Shortcut";
6) Copy this Shortcut and then go to Finder -> Applications and Paste it;
7) Rename the shortcut (if you want it) and open the Watchtower Library 2012 clicking twice