Users are referred to the detailed installation instructions distributed with your copy of Q-Chem.
An encrypted license file, qchem.license.dat, must be obtained from your vendor before you will be able to use Q-Chem. This file should be placed in the directory $QCAUX/license and must be able to be read by all users of the software. This file is node-locked, i.e., it will only operate correctly on the machine for which it was generated. Further details about obtaining this file, can be found in the installation instructions.