Yes, you will need to download the files after the launch time tomorrow, as the game now available for download is the early access version.
As to whether you could bypass any elements of the download by copying the files into the correct location on your friend's PC I have no idea. Are you using Steam or GoG? If it has any chance of working at all with Steam, I'd assume that you shouldn't actually try to install the file from your copied files, but just have them in the right place so when the Steam installer checks the files to use then it finds them there already and doesn't need to download, but I have never tried anything of the sort myself.
I am, of course, assuming that your friend has purchased the game herself, so has a key associated with her own Steam or GoG account.
