You're talking about two different things. First, is the support for Windows 10 so see here:
http://www.symantec.com/docs/TECH235458
You need to be on at least SEP 14 RU1 or higher
Second, the exe you're referring to is the Intelligent Updater. 20180521 is the current date and 003 is the revision number...see here:
http://www.symantec.com/docs/TECH102606