Downloads (Home)

All downloads are in the form of ZIP files. Clicking on a link will download the appropriate file. Once downloaded, the individual files can be extracted and used.

Older Versions of MOPAC	All these versions are placed in the public domain by SCC.
Original MOPAC from 1982 (Source)	Only the source code is provided - this original MOPAC code does not compile using modern compilers, because it contains many non-standard constructions.
MOPAC 3 released in 1985 (Source)	Only the source code is provided - this version of MOPAC does not compile using modern compilers, because it contains many non-standard constructions.
MOPAC 4 (Source)	A minor improvement on MOPAC 3, included here for historical completeness.
MOPAC 5 released in 1987 (Source) (Executable)	This was the first really popular MOPAC, and also the first to be easily compiled using a modern compiler.
MOPAC 6 released in 1989 (Source) (Executable)	An improvement over MOPAC 5.
MOPAC 7 (Source) (Executable)	An improvement over MOPAC 6.
MOPAC 7.1 released in August 2006(Source) (Executable)	All versions of MOPAC up to MOPAC 7 were written in FORTRAN 77. MOPAC 7.1 is a translation of MOPAC 7 into FORTRAN 90. Several donations of code and ideas have been incorporated into MOPAC 7.1. This version is intended for developers interested in testing ideas - it is fully functional, but not polished.
Other files
Program MAKPOL (Executable)	Windows executable only
Program BZ (Executable)	Windows executable only