The clicker app is a keyboard calibration app, I haven't used it and its not installed. I just installed the keyboard.
Edit apparently you need to copy the file over to your phone altho not sure if it needs installing separately - that's the bit I haven't done.
Thanks to Wynney666 for these instructions lifted off another thread...
Instructions:
Download and unzip (not flashable update.zip!)
Install the two apks (HTC_IME & Clicker) using your favorite method (via a file manager or adb install -r). Sense users shouldn't (and needn't) install Clicker.
There is no need to push anything to /system
Go to Menu, Settings, Language & Keyboard. Activate "HTC_IME mod"
To change keyboard, long press on lower left key on stock keyboard or any input field. Select input method in the menu.