if you
absolutely refuse to use git at all then the only way is to download a zip file (highly not recommended, because you loose the history)
else, see
http://herc.ws/board/topic/14830-updating-hercules-git-pull-problem/#entry82925
if you don't want to use the command-line interface I recommend
Github Desktop instead of TortoiseGIT
If you encounter a problem I can give step-by-step instructions on IRC:
#Hercules @ Rizon
make sure to say "meko" in the channel so I get notified