J.Tapioles

You have the wrong address in the "add_mpc.hee" file. To download the files replace
the text following (1) with the text following (2) .
Starting about half way thru you will notice the text is changed.

Good luck

Larry Wood

(1)
^Click to download updated comet data and add it to
Guide//dhttp://www.minorplanetcenter.org/iau/Ephemerides/Comets/Soft02Cmt.txt
soft02cm.txt;dhttp://www.imcce.fr/fr/ephemerides/donnees/comets/ASCII/ELTDAT.TXT
eltdat.txt;a2789^

(2)
^Click to download updated comet data and add it to
Guide//dhttp://www.minorplanetcenter.org/iau/Ephemerides/Comets/Soft02Cmt.txt
soft02cm.txt;dhttp://www.projectpluto.com/eltdat_g.txt eltdat_g.txt^