Carnegie Mellon University

ChemE Computing

Chemical Engineering Computing

GAMS License Update

The GAMS license expires annually and needs to be update. Failure to update the license will result in the software reverting to "Demo" mode which limits the size of problems it will solve and what solvers it will use. The updated (2024) license is available here . Follow the procedure below to update your license.

  1. Locate the license file you downloaded, gamslic.txt.

  2. Copy the license file from your downloads folder to the GAMS installation folder. If prompted choose Copy and Replace.

  3. Open the GAMS IDE and go to File>Options then go to the Solvers tab. You should see the number of days remainaing in the License column. If you see Demo you have done something wrong and should repeat the above procedure.