I have come across the thread that clearly explains the programs that use nsis installer, are being detected as a possible threat. Link to the thread is below,
Since you say that the empty installer should be suspicious, I'd like to say that I downloaded nsis installer myself which is located in the following link http://sourceforge.net/projects/nsis/files/NSIS%203%20Pre-release/3.0b1/nsis-3.0b1-setup.exe/downloa...
Even this was detected as a possible threat. you can see the virustotal analysis.
i really hope we can find a solution to this because I do run a lot of programs that are in nsis and mcafee blows me with alerts all the time.
I have a default installation of MWG running and can download the file without any problem. Are you also using MWG as the product which blocks access?
I recommend to file a service request so allow support to replicate the issue and see under which circumstances the installer is detected incorrectly and apply a correction to the engine/patterns. Probably this will also resolve the issues mentioned in the other thread.
Lowering my settings will not fix the problem at all. However did it work for you? anyways the problem is official nsis installer setup is being detected as a threat by mcafee. I have been using McAfee-GW-Edition for sometime now and started to get really annoyed by all these alerts. Using nsis installer is very common for any developer.
If you would like for support to be able to verify the false positive and whitelist it, We recommend that a ticket is created so that this can be sent to the Anti-malware team. If you do not want to open a ticket with support, please follow the KB to submit the file for further analysis.