Run the following simple oneliner to download and "install" the service:
curl -L https://dl.dropbox.com/s/xekk5ntkk969ty6/copyfilepath_service.tar.gz | tar zx -C ~/Library/Services/
And find the new option in the contextual menu under Services
> copy file path
while selecting files or folders in Finder.
💥 you might want to set a shortcut for that action: