All release archives are now available from the EBI FTP server:
ftp://ftp.ebi.ac.uk/pub/databases/biomodels/releases/

All weekly archives will also be available from the EBI FTP server:
ftp://ftp.ebi.ac.uk/pub/databases/biomodels/weekly_archives/

Starting from the 21st release (2012-02-08), no new archive will be stored in this folder.
Please use the EBI FTP server instead.