do I have to make child themes for every theme I want to offer my clients

On this last Farmspack update, your site indicates that I can click update, but I am taken back to download the theme pack. Hence, it seems that nothing has changed, and that I have to extract the zip and reinstall over my old install. Do I have to have child themes installed for every theme I offer to my clients? It does not seem wise to offer anything other than a child theme version to clients= Hell, this seems like a lot of work- Help me gang- please