Version 1.3.4 of the devkitPro installer/updater, which allows users to selectively download and install components of the devkitPro toolchains, includes Chishm's libfat that is now integrated to the devkitPro CVS. Normally, if you already have the old version installed, it will detect this new version and update automatically because of the auto update feature. But devkitPro says there was a problem with the previous version's auto updater, hence, you'd need to download this manually.