Thanks.
Can you confirm if this warning shows up for the Setup file, or the
files after install?
If the former, it could be mistakenly flagging all nsis setup files.
If the later, it could be doing it for py2exe.
Either way, this is indeed a false positive, and Trelby binary is
safe. Do let us know what the reply from Norton guys is, and if we can
do anything to get on the white-list quicker.
~Anil