Q-Chem 5 Package Update and Maintenance


Click here for Q-Chem 5 Manual (online). Click here for the pdf version.

Click here for Q-Chem 5 release log

Click here for Q-Chem 5 installation guide

View and download our standard form license agreement here.

Q-Chem Package Update and Maintenance

a) to update the installed Q-Chem to the latest distribution, run


You may need to run qcupdate.sh twice, as the first time it may update the installer script.

[To upgrade pre-4.2 Q-Chem installation please download and run standard installer qcinstall.sh.]

b) to re-generate and sumit license data, run

$QC/qcinstall.sh --update-lic

c) to receive regular Updates you can use Linux cron utility and add the line below as the cron command. Please consult your system administrator for questions about using cron.

$QC/qcupdate.sh > $QC/qcupdate.log