Minecraft Tekkit will not install; Norton determines WS.Reputation.1 threat

Techniclauncher.exe from www.technicpack.net/download is determined to be unsafe by Norton due to a WS.Reputation.1 threat and is removed.  I have read that other virus softwares will allow this program and I know of other users that are running this software without threat.

I need an analysis of this software to know if it is really a threat or if it is simply a number of downloads issue with the 'reputation' of the software.  It is open source and appears to be safe.