Wintermute has updated his Devkit for the DS, whats new:
Earlier versions of the installer have had problems with checking the version of the ini file which contains the current versions of the packages. This resulted in the internal ini file being used in preference to the downloaded file when copying the installer and associated files to a machine with no internet access and causing the install to fail. Version 1.2.5 attempted to address this issue but a bug was introduced which prevented the installer from downloading a new version of itself. If you use the updater and it doesn't download 1.2.6 then please download this version manually using the link above. Apologies for any inconvenience.