NIS 2014 - Version 21.0.0.100 versus Version 21.01.3!

Hi

 

There are 2 different versions of norton internet security 21 (Also called NIS 2014 by some others).

 

21.0.1.100 (Install file has NIS- in it.  Available from buy . norton . com)

21.0.1.3 (Install file has TW- in it.  Also the trial available for download is this version)

 

I have 21.0.1.100 version installed.  It is up to date.  Updatecenter shows it as up to date.  However when I check the version of installed product it is still the one ending with .100.

 

Can someone clarify this for me??????