As Jafo said, get another AV program. Further advice: Run, don't walk!
Symantec is absolute crap these days. WS.Reputation1 as had developers in arms for YEARS, since it is the equivalent of 'guilty until proven innocent'.
It does NOT mean that the AV heuristics have found something suspicious (as in anything!) in that file. No, not at all!
It simply means that users of that particular AV solution have not seen/run that version of the software enough times for it to be considered safe. So, instead of letting it go with a sensible warning (e.g.; 'we do not know what this application does, but we couldn't detect anything suspicious either, up to you to run it or not') it throws up a scary warning as if the file was actually infected with something. And then it proceeds to quarantine and delete it... based on NOTHING but that version of the software being brand new!