Backup Exec 2015 - Agent For Windows???

Hello all - 

I am currently upgrading my servers (FROM: Windows 2008 R2 with Backup Exec 2010 R3, TO: Server 2012 R2 with Backup Exec 2015).

I do not recall ever needing a separate - 'Agent for Windows' when I purchased my licenses Backup Exec 2010 R3.  

*Therefore my question is, will I now be missing functionality that I had before with 2010 R3?*  

Thanks in advance! :)