The GAMS/CPLEX Link and GAMS/OSICPLEX each require that you have a valid license agreement with IBM for use of the current version of the CPLEX library.
To add either solver to your GAMS license, please write to firstname.lastname@example.org to confirm that you have such a license agreement and that your use of the GAMS solver will comply with the terms of that license agreement. Please reference your License ID, DCxxxx.
Please note that GAMS/OSICPLEX does not support all features of a GAMS/CPLEX, but the GAMS/CPLEX Link does. For details visit this page.