No. You need to upgrade to CRD 5.6 in order to use XI. You need to follow the instructions in the Member Area on how to migrate your schedules from CRD 4 to CRD 5.

If you have recently changed your version of Crystal, you can simply run the "Change Crystal Version" shortcut in the Windows start menu folder for CRD 5 and select your new version of Crystal. No need to re-install the application.