As some of you know, the ability to download full kits at once was implemented only relatively recently. Full kits require a decent number of download credits to download, and are intended to be a "bonus" for people who donate to support Pixel Scrapper: people who don't wish to donate (or don't have the resources) can download most kit items individually for free as those items are uploaded (so you really can get just about everything on this site for free--for personal or commercial use: just not all at once).