Backup Exec 2014 with SP2 upgrade Steps Bckup Exec 15

Hi,

I have operating system Windows Server 2012 R2 Standard with Backup Exec 2014 SP2, when I run live update I found below 2 updates

Backup Exec 2014 Revision 1786 Hotfix 227745  (147547.6 KB)
Symantec Backup Exec 15 is now available!         (2578.4 KB)

I also got it upgrade License from symantec Backup Exec 15 so in this situation and I download the file (Backup_Exec_15_14.2.1180_MultiPlatforms_Multilingual.zip)  (1,673,165 KB)

Now in this situation I would like to upgrade my Backup Exec 2014 SP2 to Backup Exec 15. So I am requesting any guidance or guided steps to perfrom upgrade Backup Exec15 task.

With many thanks and Waiting for kind reply

Asim Sami
Jeddah, KSA