Don't be stupid, of course it doesn't. If you're so worried about it, download the manual install zip file from GitHub and scan that before extracting it over the top of the existing files. VirusTotal says that Avast only detects the installer as a FP, not the manual zip file.
"Dropper-gen" is a generic label for "something that installs a program" and isn't the name of any virus. Avast is known for high FP rates on "-gen" detections. Some basic web searching will give you this same information.
I cannot prevent false positives on crappy AV programs, there is absolutely nothing I can do about it. I'd recommend you use Microsoft Security Essentials, which is free, and a much better option than Avast or AVG.