6.0, 6.1 or 7.0, but one version does not supersede the others. In short, version 7.0 will provide a more accurate model for long term projections. Version 6.0 and 6.1 use a different database, but the same model. Version 7.0 uses a different model and a different database.
More help is available once the software is installed.
1996 - Attention.txt file was replaced. Time Use - microdata file and documentation replaced, variables on sports affected. 1994 - revised SPSS file released cads94v3.sps. See Attention.txt for details. They now contain 1972-1998 data, but they no longer contain field of study.