Hello Euan,
I do not know what is triggering the antivirus warning but I can assure you there is no virus in the binary.
The Windows version does not support SVG export. Only the online version supports that feature. You mentioned by email that you were having trouble with the online version - can you let me know more details about the issue you are having so I can fix it? What browser are you using?
Cheers,
Chris.