On Windows 7 BikeCAD Pro is by default installed at: C:\Users\yourUserName\AppData\Roaming\BikeCAD Pro 11.0\. Regardless of whether BikeCAD was installed there, or if you chose an alternate location to install BikeCAD, the simplest way to navigate to the installation directory is to right click on the BikeCAD Pro icon. In the popup menu that appears, select Open File Location as shown below.
If Open File Location is not available in your popup menu, then you can choose Properties as shown below. Then, in the Properties dialog box, select Open File Location.