Recommend using the new MOPAC2012
Lanthanide Sparkles are fully implemented in MOPAC2009
MOPAC2009 is now available, free for academics, from http://openmopac.net.
MOPAC2009 is a software released by Prof. James J. P. Stewart from Stewart Computational Chemistry of Colorado Springs, CO, and represents a recent version of the MOPAC series of molecular modeling softwares, which started in 1981.
MOPAC2009 has Lanthanide Complexes Sparkle/AM1, Sparkle/PM3, and Sparkle/PM6 fully implemented.
In order to be acquainted with the software, users are encouraged to read the MOPAC2009 manual at http://openmopac.net/manual/.
As the MOPAC2009 manual says:
“MOPAC is written with the non-theoretician in mind. While MOPAC calls upon many concepts in quantum theory and thermodynamics and uses some fairly advanced mathematics, the users need not be familiar with these specialized topics.”