Thank you for trying BlackBerry Address Book Synchronizer, Please download following two files on your BlackBerry according to OS of BlackBerry.
BlackBerry OS 4.2 OR Above (Pearl/ Curve/ Bold/ Storm)
AddressBookSynchronizer
AutoAddressBookSender
BlackBerry OS 3.8 or Above(OS 3.8, 4.0, 4.1)
AddressBookSynchronizer
AutoAddressBookSender