How do I know if the Norton Removal Tool I have is the most up to date?

I am using Windows 7 64 bit Service Pack 1.  I used Avast in the past and still have their sandbox & a lot of their files, etc. on my computer.  I need to get rid of them because I'm running out of disc space.  However, in trying to do so, using avastclear.exe in Safe Mode, avastclear said I need to remove my norton security so that my computer is not rendered unstable (or words to that effect).  I want to be sure that the Norton Removal Tool I have is the most up-to-date one because I installed it in May of 2015.  I have scoured the Norton website and can't find this info.  How can I check on this?

 

Thanks!

-LKirk

P.S.  I don't know if I chose a label that correctly categorized this question.  I have no clue what this would fall under.