The Rally Course Designer offers a free 30-day trial for you to try it out. After that, the program will lock you out from further use. To unlock the program, you must purchase a Product Activation Key (PAK).
If you have passed the 30-day free trial period, you will be forced to enter a valid PAK. If you purchase the PAK prior to the end of your trial period, then open the program and select HELP -> Product Status. To activate, you will use the EMail address you provided when you made the purchased, along with the 8-character PAK. Once validated, the program should open for any user on this computer.
If you need to install this program on another computer, you must select HELP -> Product Status and de-activate this copy before your EMail and PAK will work on another computer.