You don't need to buy every update of the application. From the moment of purchase you are entitled to update it every time it receives and update from its developer.
To play Blu-ray discs on your Asus computer, you will need a compatible BD-ROM device (Blu-ray DVD-ROM) that can be purchased from Amazon or NewEgg websites. You don't need drivers, only an application that is capable of playing these discs. You can try VLC to play the discs.