Reference thread: http://www.codeweavers.com/support/forums/general/?t=27;forumcurPos=300;msg=94431
Since this does not come as an installer package, you will need to manually install it. I used the following steps (on Mac OSX 10.7 Lion):
1. Create a new WinXP bottle
2. From the pull-down menu, go to Configure > Manage Bottles...
3. Select the new bottle and then select the Advanced tab
4. Click on the "Open C: in Finder" button
5. In the Finder window, open the "Program Files" folder
6. Unzip the application to be manually installed and copy the unzipped folder into the Program Files folder
7. Back to Crossover's pull-down menu, go to Programs > Run Command...
8. Make sure your new WinXP bottle is selected next to "Use Bottle:"
9. Click the "Browse..." button next to Command
10. In the "Please choose a file to run" window, select the EXE file to be run, found in the application folder you just copied into the Program Files folder, and then click the "Open" button
11. Click the "Save Command to Programs Menu" and the EXE should now be added in your Crossover pull-down menu (under Programs)