[R] any package can do such job?

[ronggui]

any one know any packages can do the job describe in Michael E. Sobel's artical NEARAND
LOG-NONLINEAR MODELS   FOR ORDINALSCALES WITH     MIDPOINTS, WITHAN  APPLICATION TO PUBLIC
OPINION DATA .it is said that "A set of S Plus instructions to fit the models described in Section 3 of this  paper is available from Statlib at     htp://lib.stat.cmu.edu/general/midpoints.splus, or
by sending the E-mail message ¡°send midpoints.splus from general¡± to statlib at stat.
cmu.edu."  but it seems can't be found on the website above.

thank you in advance !