www.charmm.org has information about obtaining CHARMM.
See http://charmm.chemistry.harvard.edu/charmm_lite.php for instructions on how to download the most recent freely available version of CHARMM.

Version 44b1 was released a couple of weeks ago. Version 41 is already 4 years old.


Lennart Nilsson
Karolinska Institutet
Stockholm, Sweden